From 780afb0c56e09acb95e418f439a526cede07411e Mon Sep 17 00:00:00 2001
From: tikaiz <tikaiz@gmx.at>
Date: Fri, 13 Mar 2026 14:12:00 +0100
Subject: [PATCH] Translate App into German

---
 .../dist/csv/teams.csv                        | 12 +--
 .../dist/csv/tournaments.csv                  |  6 +-
 backend_splatournament_manager/src/app.ts     | 80 +++++++++----------
 .../src/middlewares/auth-middleware.ts        |  4 +-
 .../src/services/match-service.ts             |  6 +-
 .../src/services/team-service.ts              |  2 +-
 .../src/services/user-service.ts              |  4 +-
 docs/prompts.md                               | 38 +++++++++
 .../android/app/src/main/AndroidManifest.xml  |  2 +-
 .../ios/Runner/Info.plist                     |  4 +-
 frontend_splatournament_manager/lib/main.dart |  8 ++
 .../lib/pages/create_team_page.dart           | 50 +++++++-----
 .../lib/pages/create_tournament_page.dart     | 47 ++++++-----
 .../lib/pages/home_page.dart                  | 14 ++--
 .../lib/pages/login_page.dart                 | 23 +++---
 .../lib/pages/settings_page.dart              |  8 +-
 .../lib/pages/tournament_bracket_page.dart    | 74 ++++++++++-------
 .../lib/pages/tournament_detail_page.dart     | 68 ++++++++++------
 .../lib/providers/match_provider.dart         | 31 ++++---
 .../lib/providers/tournament_provider.dart    | 30 ++++---
 .../lib/services/auth_service.dart            | 10 ++-
 .../lib/services/team_service.dart            | 78 ++++++++++--------
 .../widgets/available_tournament_list.dart    | 11 ++-
 .../lib/widgets/my_teams_widget.dart          | 52 ++++++++----
 .../lib/widgets/my_tournaments_carousel.dart  | 12 +--
 .../lib/widgets/profile_widget.dart           |  8 +-
 .../lib/widgets/teams_list_widget.dart        | 61 +++++++++-----
 .../lib/widgets/theme_selector_widget.dart    | 12 +--
 .../linux/runner/my_application.cc            |  4 +-
 frontend_splatournament_manager/pubspec.yaml  |  2 +
 .../web/index.html                            |  8 +-
 .../web/manifest.json                         |  6 +-
 .../windows/runner/Runner.rc                  |  4 +-
 .../windows/runner/main.cpp                   |  2 +-
 34 files changed, 477 insertions(+), 304 deletions(-)

diff --git a/backend_splatournament_manager/dist/csv/teams.csv b/backend_splatournament_manager/dist/csv/teams.csv
index 35fabaa..4f75541 100644
--- a/backend_splatournament_manager/dist/csv/teams.csv
+++ b/backend_splatournament_manager/dist/csv/teams.csv
@@ -1,7 +1,7 @@
 name,tag,description
-Team Alpha,ALP,A competitive esports team
-Team Beta,BET,New challengers on the scene
-Team Gamma,GAM,Veteran tournament winners
-Team Delta,DEL,Rising stars in the community
-Team Epsilon,EPS,Strategic gameplay specialists
-Team Zeta,ZET,Fast-paced aggressive players
+Team Alpha,ALP,Ein wettbewerbsorientiertes E-Sport-Team
+Team Beta,BET,Neue Herausforderer in der Szene
+Team Gamma,GAM,Erfahrene Turniersieger
+Team Delta,DEL,Aufstrebende Stars der Community
+Team Epsilon,EPS,Spezialisten für strategisches Gameplay
+Team Zeta,ZET,Schnelle und aggressive Spieler
diff --git a/backend_splatournament_manager/dist/csv/tournaments.csv b/backend_splatournament_manager/dist/csv/tournaments.csv
index c68122c..db93b5e 100644
--- a/backend_splatournament_manager/dist/csv/tournaments.csv
+++ b/backend_splatournament_manager/dist/csv/tournaments.csv
@@ -1,4 +1,4 @@
 name,description,maxTeamAmount,currentTeamAmount,registrationStartDate,registrationEndDate
-Demo Tournament  ,This is a demo tournament, 2, 0, 2026-02-01, 2026-02-28
-Demo Tournament 2,This is a second demo tournament, 4, 5, 2026-03-01, 2026-03-15
-Demo Tournament 3,This is a third demo tournament, 8, 8, 2026-03-15, 2026-03-20
+Demo-Turnier,Dies ist ein Demo-Turnier, 2, 0, 2026-02-01, 2026-02-28
+Demo-Turnier 2,Dies ist ein zweites Demo-Turnier, 4, 5, 2026-03-01, 2026-03-15
+Demo-Turnier 3,Dies ist ein drittes Demo-Turnier, 8, 8, 2026-03-15, 2026-03-20
diff --git a/backend_splatournament_manager/src/app.ts b/backend_splatournament_manager/src/app.ts
index 6d6b545..c719e97 100644
--- a/backend_splatournament_manager/src/app.ts
+++ b/backend_splatournament_manager/src/app.ts
@@ -37,7 +37,7 @@ app.get('/tournaments', async (req: Request, res: Response) => {
 app.get('/tournaments/:id', async (req: Request, res: Response) => {
     const tournament = await tournamentService.getTournamentById(+req.params.id);
     if (!tournament) {
-        return res.status(404).send({error: 'Tournament not found'});
+        return res.status(404).send({error: 'Turnier nicht gefunden'});
     }
     res.send(tournament);
 });
@@ -48,7 +48,7 @@ app.post('/tournaments', authMiddleware, async (req: Request, res: Response) =>
         res.status(201).send();
     } catch (err){
         console.log(err);
-        res.status(400).send({error: 'Failed to create tournament'});
+        res.status(400).send({error: 'Turnier konnte nicht erstellt werden'});
     }
 });
 
@@ -56,18 +56,18 @@ app.put('/tournaments/:id', authMiddleware, async (req: Request, res: Response)
     try {
         await tournamentService.updateTournament(+req.params.id, req.body);
     } catch (err) {
-        return res.status(400).send({error: 'Failed to update Tournament'});
+        return res.status(400).send({error: 'Turnier konnte nicht aktualisiert werden'});
     }
-    res.status(200).send({message: 'Tournament updated successfully'});
+    res.status(200).send({message: 'Turnier erfolgreich aktualisiert'});
 });
 
 app.delete('/tournaments/:id', authMiddleware, async (req: Request, res: Response) => {
     try {
         await tournamentService.deleteTournament(+req.params.id);
     } catch (err) {
-        return res.status(400).send({error: 'Failed to delete Tournament'});
+        return res.status(400).send({error: 'Turnier konnte nicht gelöscht werden'});
     }
-    res.status(200).send({message: 'Tournament deleted successfully'});
+    res.status(200).send({message: 'Turnier erfolgreich gelöscht'});
 });
 
 app.post('/tournaments/:id/bracket', authMiddleware, async (req: Request, res: Response) => {
@@ -77,14 +77,14 @@ app.post('/tournaments/:id/bracket', authMiddleware, async (req: Request, res: R
         const teamIds = teams.map(team => team.id);
         
         if (teamIds.length < 2) {
-            return res.status(400).send({error: 'At least 2 teams are required to initialize bracket'});
+            return res.status(400).send({error: 'Mindestens 2 Teams sind erforderlich, um den Turnierbaum zu initialisieren'});
         }
         
         await matchService.initializeBracket(tournamentId, teamIds);
-        res.status(201).send({message: 'Bracket initialized successfully'});
+        res.status(201).send({message: 'Turnierbaum erfolgreich initialisiert'});
     } catch (err) {
         console.log(err);
-        res.status(400).send({error: 'Failed to initialize bracket'});
+        res.status(400).send({error: 'Turnierbaum konnte nicht initialisiert werden'});
     }
 });
 
@@ -94,7 +94,7 @@ app.get('/tournaments/:id/matches', async (req: Request, res: Response) => {
         res.send(matches);
     } catch (err) {
         console.log(err);
-        res.status(400).send({error: 'Failed to get matches'});
+        res.status(400).send({error: 'Matches konnten nicht geladen werden'});
     }
 });
 
@@ -102,23 +102,23 @@ app.put('/matches/:id/winner', authMiddleware, async (req: Request, res: Respons
     try {
         const {winnerId} = req.body;
         if (!winnerId) {
-            return res.status(400).send({error: 'winnerId is required'});
+            return res.status(400).send({error: 'winnerId ist erforderlich'});
         }
         await matchService.setMatchWinner(+req.params.id, +winnerId);
-        res.status(200).send({message: 'Winner set successfully'});
+        res.status(200).send({message: 'Sieger erfolgreich festgelegt'});
     } catch (err: any) {
         console.log(err);
-        res.status(400).send({error: err.message || 'Failed to set winner'});
+        res.status(400).send({error: err.message || 'Sieger konnte nicht festgelegt werden'});
     }
 });
 
 app.delete('/matches/:id/winner', authMiddleware, async (req: Request, res: Response) => {
     try {
         await matchService.resetMatch(+req.params.id);
-        res.status(200).send({message: 'Match reset successfully'});
+        res.status(200).send({message: 'Match erfolgreich zurückgesetzt'});
     } catch (err) {
         console.log(err);
-        res.status(400).send({error: 'Failed to reset match'});
+        res.status(400).send({error: 'Match konnte nicht zurückgesetzt werden'});
     }
 });
 
@@ -130,7 +130,7 @@ app.get('/teams', async (req: Request, res: Response) => {
 app.get('/teams/:id', async (req: Request, res: Response) => {
     const team = await teamService.getTeamById(+req.params.id);
     if (!team) {
-        return res.status(404).send({error: 'Team not found'});
+        return res.status(404).send({error: 'Team nicht gefunden'});
     }
     res.send(team);
 });
@@ -138,10 +138,10 @@ app.get('/teams/:id', async (req: Request, res: Response) => {
 app.post('/teams', authMiddleware, async (req: Request, res: Response) => {
     const {name, tag, description} = req.body;
     if (!name || !tag) {
-        return res.status(400).send({error: 'name and tag are required'});
+        return res.status(400).send({error: 'Name und Kürzel sind erforderlich'});
     }
     if (tag.length > 3) {
-        return res.status(400).send({error: 'tag must be at most 3 characters'});
+        return res.status(400).send({error: 'Das Kürzel darf höchstens 3 Zeichen lang sein'});
     }
     try {
         const team = await teamService.addTeam({name, tag, description: description ?? ''});
@@ -151,30 +151,30 @@ app.post('/teams', authMiddleware, async (req: Request, res: Response) => {
         res.status(201).send(team);
     } catch (err) {
         console.log(err);
-        res.status(400).send({error: 'Failed to create team'});
+        res.status(400).send({error: 'Team konnte nicht erstellt werden'});
     }
 });
 
 app.put('/teams/:id', authMiddleware, async (req: Request, res: Response) => {
     const {tag} = req.body;
     if (tag && tag.length > 3) {
-        return res.status(400).send({error: 'tag must be at most 3 characters'});
+        return res.status(400).send({error: 'Das Kürzel darf höchstens 3 Zeichen lang sein'});
     }
     try {
         await teamService.updateTeam(+req.params.id, req.body);
     } catch (err) {
-        return res.status(400).send({error: 'Failed to update team'});
+        return res.status(400).send({error: 'Team konnte nicht aktualisiert werden'});
     }
-    res.status(200).send({message: 'Team updated successfully'});
+    res.status(200).send({message: 'Team erfolgreich aktualisiert'});
 });
 
 app.delete('/teams/:id', authMiddleware, async (req: Request, res: Response) => {
     try {
         await teamService.deleteTeam(+req.params.id);
     } catch (err) {
-        return res.status(400).send({error: 'Failed to delete team'});
+        return res.status(400).send({error: 'Team konnte nicht gelöscht werden'});
     }
-    res.status(200).send({message: 'Team deleted successfully'});
+    res.status(200).send({message: 'Team erfolgreich gelöscht'});
 });
 
 app.get('/tournaments/:id/teams', async (req: Request, res: Response) => {
@@ -185,16 +185,16 @@ app.get('/tournaments/:id/teams', async (req: Request, res: Response) => {
 app.post('/tournaments/:id/teams', authMiddleware, async (req: Request, res: Response) => {
     const {teamId} = req.body;
     if (!teamId) {
-        return res.status(400).send({error: 'teamId is required'});
+        return res.status(400).send({error: 'teamId ist erforderlich'});
     }
     try {
         const entry = await teamService.registerTeamForTournament(+req.params.id, +teamId);
         res.status(201).send(entry);
     } catch (err: any) {
         if (err.message?.includes('UNIQUE constraint failed')) {
-            return res.status(409).send({error: 'Team is already registered for this tournament'});
+            return res.status(409).send({error: 'Das Team ist bereits für dieses Turnier angemeldet'});
         }
-        res.status(400).send({error: 'Failed to register team'});
+        res.status(400).send({error: 'Team konnte nicht für das Turnier angemeldet werden'});
     }
 });
 
@@ -202,9 +202,9 @@ app.delete('/tournaments/:id/teams/:teamId', authMiddleware, async (req: Request
     try {
         await teamService.removeTeamFromTournament(+req.params.id, +req.params.teamId);
     } catch (err) {
-        return res.status(400).send({error: 'Failed to remove team from tournament'});
+        return res.status(400).send({error: 'Team konnte nicht aus dem Turnier entfernt werden'});
     }
-    res.status(200).send({message: 'Team removed from tournament'});
+    res.status(200).send({message: 'Team aus dem Turnier entfernt'});
 });
 
 app.get('/teams/:id/tournaments', async (req: Request, res: Response) => {
@@ -220,7 +220,7 @@ app.get('/users/me/teams', authMiddleware, async (req: Request, res: Response) =
         res.send(teams);
     } catch (err) {
         console.log(err);
-        res.status(400).send({error: 'Failed to get user teams'});
+        res.status(400).send({error: 'Eigene Teams konnten nicht geladen werden'});
     }
 });
 
@@ -232,14 +232,14 @@ app.post('/teams/:id/members', authMiddleware, async (req: Request, res: Respons
         
         const isInTeam = await teamService.isUserInTeam(teamId, userId);
         if (isInTeam) {
-            return res.status(409).send({error: 'User is already a member of this team'});
+            return res.status(409).send({error: 'Du bist bereits Mitglied dieses Teams'});
         }
         
         const member = await teamService.addTeamMember(teamId, userId, 'member');
         res.status(201).send(member);
     } catch (err) {
         console.log(err);
-        res.status(400).send({error: 'Failed to join team'});
+        res.status(400).send({error: 'Beitritt zum Team fehlgeschlagen'});
     }
 });
 
@@ -249,10 +249,10 @@ app.delete('/teams/:id/members/me', authMiddleware, async (req: Request, res: Re
         const userId = req.user.id;
         const teamId = +req.params.id;
         await teamService.removeTeamMember(teamId, userId);
-        res.status(200).send({message: 'Left team successfully'});
+        res.status(200).send({message: 'Team erfolgreich verlassen'});
     } catch (err) {
         console.log(err);
-        res.status(400).send({error: 'Failed to leave team'});
+        res.status(400).send({error: 'Team konnte nicht verlassen werden'});
     }
 });
 
@@ -262,36 +262,36 @@ app.get('/teams/:id/members', async (req: Request, res: Response) => {
         res.send(members);
     } catch (err) {
         console.log(err);
-        res.status(400).send({error: 'Failed to get team members'});
+        res.status(400).send({error: 'Teammitglieder konnten nicht geladen werden'});
     }
 });
 
 app.post('/register', async (req: Request, res: Response) => {
     const { username, password } = req.body;
     if (!username || !password) {
-        return res.status(400).send({ error: 'Username and password are required' });
+        return res.status(400).send({ error: 'Benutzername und Passwort sind erforderlich' });
     }
     try {
         const user = await userService.register(username, password);
         res.status(201).send(user);
     } catch (err: any) {
         if (err.message?.includes('UNIQUE constraint failed')) {
-            return res.status(409).send({ error: 'Username already exists' });
+            return res.status(409).send({ error: 'Benutzername existiert bereits' });
         }
-        res.status(500).send({ error: 'Registration failed' });
+        res.status(500).send({ error: 'Registrierung fehlgeschlagen' });
     }
 });
 
 app.post('/login', async (req: Request, res: Response) => {
     const { username, password } = req.body;
     if (!username || !password) {
-        return res.status(400).send({ error: 'Username and password are required' });
+        return res.status(400).send({ error: 'Benutzername und Passwort sind erforderlich' });
     }
     try {
         const user = await userService.login(username, password);
         res.status(200).send(user);
     } catch (err: any) {
-        res.status(401).send({ error: err.message || 'Login failed' });
+        res.status(401).send({ error: err.message || 'Anmeldung fehlgeschlagen' });
     }
 });
 
diff --git a/backend_splatournament_manager/src/middlewares/auth-middleware.ts b/backend_splatournament_manager/src/middlewares/auth-middleware.ts
index 962bd71..95fc0b0 100644
--- a/backend_splatournament_manager/src/middlewares/auth-middleware.ts
+++ b/backend_splatournament_manager/src/middlewares/auth-middleware.ts
@@ -6,7 +6,7 @@ const JWT_SECRET = process.env.JWT_SECRET || "key"
 export const authMiddleware = (req: Request, res: Response, next: NextFunction) => {
     const authHeader = req.headers.authorization;
     if (!authHeader || !authHeader.startsWith('Bearer ')) {
-        return res.status(401).send({ error: 'Unauthorized: No token provided' });
+        return res.status(401).send({ error: 'Nicht autorisiert: Kein Token angegeben' });
     }
     const token = authHeader.split(' ')[1];
     try {
@@ -17,6 +17,6 @@ export const authMiddleware = (req: Request, res: Response, next: NextFunction)
 
         next();
     } catch (err) {
-        return res.status(401).send({ error: 'Unauthorized: Invalid token' });
+        return res.status(401).send({ error: 'Nicht autorisiert: Ungültiger Token' });
     }
 };
diff --git a/backend_splatournament_manager/src/services/match-service.ts b/backend_splatournament_manager/src/services/match-service.ts
index 2a4b8df..10fcbb1 100644
--- a/backend_splatournament_manager/src/services/match-service.ts
+++ b/backend_splatournament_manager/src/services/match-service.ts
@@ -120,11 +120,11 @@ export class MatchService {
                 [matchId],
                 (err, match: any) => {
                     if (err) return reject(err);
-                    if (!match) return reject(new Error('Match not found'));
+                    if (!match) return reject(new Error('Match nicht gefunden'));
 
                     // Validate that the winnerId is one of the participants
                     if (match.team1Id !== winnerId && match.team2Id !== winnerId) {
-                        return reject(new Error('Winner must be one of the match participants'));
+                        return reject(new Error('Der Sieger muss eines der Teams dieses Matches sein'));
                     }
 
                     // Update the match with winner
@@ -182,7 +182,7 @@ export class MatchService {
                 [matchId],
                 (err, match: any) => {
                     if (err) return reject(err);
-                    if (!match) return reject(new Error('Match not found'));
+                    if (!match) return reject(new Error('Match nicht gefunden'));
 
                     const previousWinnerId = match.winnerId;
 
diff --git a/backend_splatournament_manager/src/services/team-service.ts b/backend_splatournament_manager/src/services/team-service.ts
index f94b811..80415a8 100644
--- a/backend_splatournament_manager/src/services/team-service.ts
+++ b/backend_splatournament_manager/src/services/team-service.ts
@@ -183,7 +183,7 @@ export class TeamService {
         (err: Error | null, row: any) => {
           if (err) return reject(err);
           if (row.count >= 4) {
-            return reject(new Error('Team already has maximum of 4 members'));
+            return reject(new Error('Das Team hat bereits die maximale Anzahl von 4 Mitgliedern'));
           }
           
           const stmt = this.db.prepare(`INSERT INTO TeamMembers (teamId, userId, role) VALUES (?, ?, ?)`);
diff --git a/backend_splatournament_manager/src/services/user-service.ts b/backend_splatournament_manager/src/services/user-service.ts
index dcd7db3..32f17d1 100644
--- a/backend_splatournament_manager/src/services/user-service.ts
+++ b/backend_splatournament_manager/src/services/user-service.ts
@@ -74,12 +74,12 @@ export class UserService {
                         return reject(err);
                     }
                     if (!user) {
-                        return reject(new Error('User not found'));
+                        return reject(new Error('Benutzer nicht gefunden'));
                     }
                     try {
                         const valid = await argon2.verify(user.password, password);
                         if (!valid) {
-                            return reject(new Error('Invalid password'));
+                            return reject(new Error('Ungültiges Passwort'));
                         }
                         const token = jwt.sign({ id: user.id, username: user.username }, JWT_SECRET, { expiresIn: '7d' });
                         resolve({ id: user.id, username: user.username, token });
diff --git a/docs/prompts.md b/docs/prompts.md
index 79dad8b..dcb0c61 100644
--- a/docs/prompts.md
+++ b/docs/prompts.md
@@ -110,3 +110,41 @@ Folgende Dateien wurden in diesem Prompt verändert:
     - frontend_splatournament_manager/lib/providers/match_provider.dart (neu erstellt)
     - frontend_splatournament_manager/lib/main.dart
     - frontend_splatournament_manager/lib/pages/tournament_bracket_page.dart
+
+## 13.03.2026
+
+- Translate the entire app into German, and also translate the relevant DB seeding CSVs.   
+Folgende Dateien wurden in diesem Prompt verändert:
+    - backend_splatournament_manager/src/app.ts
+    - backend_splatournament_manager/src/middlewares/auth-middleware.ts
+    - backend_splatournament_manager/src/services/user-service.ts
+    - backend_splatournament_manager/src/services/team-service.ts
+    - backend_splatournament_manager/src/services/match-service.ts
+    - backend_splatournament_manager/dist/csv/teams.csv
+    - backend_splatournament_manager/dist/csv/tournaments.csv
+    - frontend_splatournament_manager/pubspec.yaml
+    - frontend_splatournament_manager/lib/main.dart
+    - frontend_splatournament_manager/lib/pages/login_page.dart
+    - frontend_splatournament_manager/lib/pages/home_page.dart
+    - frontend_splatournament_manager/lib/pages/create_team_page.dart
+    - frontend_splatournament_manager/lib/pages/create_tournament_page.dart
+    - frontend_splatournament_manager/lib/pages/settings_page.dart
+    - frontend_splatournament_manager/lib/pages/tournament_detail_page.dart
+    - frontend_splatournament_manager/lib/pages/tournament_bracket_page.dart
+    - frontend_splatournament_manager/lib/providers/tournament_provider.dart
+    - frontend_splatournament_manager/lib/providers/match_provider.dart
+    - frontend_splatournament_manager/lib/services/auth_service.dart
+    - frontend_splatournament_manager/lib/services/team_service.dart
+    - frontend_splatournament_manager/lib/widgets/available_tournament_list.dart
+    - frontend_splatournament_manager/lib/widgets/profile_widget.dart
+    - frontend_splatournament_manager/lib/widgets/teams_list_widget.dart
+    - frontend_splatournament_manager/lib/widgets/theme_selector_widget.dart
+    - frontend_splatournament_manager/lib/widgets/my_teams_widget.dart
+    - frontend_splatournament_manager/lib/widgets/my_tournaments_carousel.dart
+    - frontend_splatournament_manager/web/index.html
+    - frontend_splatournament_manager/web/manifest.json
+    - frontend_splatournament_manager/android/app/src/main/AndroidManifest.xml
+    - frontend_splatournament_manager/ios/Runner/Info.plist
+    - frontend_splatournament_manager/linux/runner/my_application.cc
+    - frontend_splatournament_manager/windows/runner/main.cpp
+    - frontend_splatournament_manager/windows/runner/Runner.rc
\ No newline at end of file
diff --git a/frontend_splatournament_manager/android/app/src/main/AndroidManifest.xml b/frontend_splatournament_manager/android/app/src/main/AndroidManifest.xml
index be6c6a2..40e4461 100644
--- a/frontend_splatournament_manager/android/app/src/main/AndroidManifest.xml
+++ b/frontend_splatournament_manager/android/app/src/main/AndroidManifest.xml
@@ -2,7 +2,7 @@
 
     <uses-permission android:name="android.permission.INTERNET"/>
     <application
-        android:label="frontend_splatournament_manager"
+        android:label="Splatournament Manager"
         android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher">
         <activity
diff --git a/frontend_splatournament_manager/ios/Runner/Info.plist b/frontend_splatournament_manager/ios/Runner/Info.plist
index 861a9a6..1013416 100644
--- a/frontend_splatournament_manager/ios/Runner/Info.plist
+++ b/frontend_splatournament_manager/ios/Runner/Info.plist
@@ -7,7 +7,7 @@
 	<key>CFBundleDevelopmentRegion</key>
 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 	<key>CFBundleDisplayName</key>
-	<string>Frontend Splatournament Manager</string>
+	<string>Splatournament Manager</string>
 	<key>CFBundleExecutable</key>
 	<string>$(EXECUTABLE_NAME)</string>
 	<key>CFBundleIdentifier</key>
@@ -15,7 +15,7 @@
 	<key>CFBundleInfoDictionaryVersion</key>
 	<string>6.0</string>
 	<key>CFBundleName</key>
-	<string>frontend_splatournament_manager</string>
+	<string>Splatournament Manager</string>
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
diff --git a/frontend_splatournament_manager/lib/main.dart b/frontend_splatournament_manager/lib/main.dart
index 1fc305e..5b79bc5 100644
--- a/frontend_splatournament_manager/lib/main.dart
+++ b/frontend_splatournament_manager/lib/main.dart
@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:frontend_splatournament_manager/pages/home_page.dart';
 import 'package:frontend_splatournament_manager/pages/login_page.dart';
 import 'package:frontend_splatournament_manager/pages/settings_page.dart';
@@ -34,6 +35,13 @@ class SplatournamentApp extends StatelessWidget {
     return MaterialApp.router(
       title: 'Splatournament Manager',
       routerConfig: routes,
+      locale: const Locale('de', 'DE'),
+      supportedLocales: const [Locale('de', 'DE')],
+      localizationsDelegates: const [
+        GlobalMaterialLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+        GlobalCupertinoLocalizations.delegate,
+      ],
       themeMode: themeProvider.themeMode,
       theme: themeProvider.lightTheme,
       darkTheme: themeProvider.darkTheme,
diff --git a/frontend_splatournament_manager/lib/pages/create_team_page.dart b/frontend_splatournament_manager/lib/pages/create_team_page.dart
index 92feacd..e6e6d20 100644
--- a/frontend_splatournament_manager/lib/pages/create_team_page.dart
+++ b/frontend_splatournament_manager/lib/pages/create_team_page.dart
@@ -23,9 +23,13 @@ class _CreateTeamPageState extends State<CreateTeamPage> {
   @override
   void initState() {
     super.initState();
-    _nameController = TextEditingController(text: widget.teamToEdit?.name ?? '');
+    _nameController = TextEditingController(
+      text: widget.teamToEdit?.name ?? '',
+    );
     _tagController = TextEditingController(text: widget.teamToEdit?.tag ?? '');
-    _descriptionController = TextEditingController(text: widget.teamToEdit?.description ?? '');
+    _descriptionController = TextEditingController(
+      text: widget.teamToEdit?.description ?? '',
+    );
   }
 
   void _submitForm() async {
@@ -42,9 +46,9 @@ class _CreateTeamPageState extends State<CreateTeamPage> {
           tag: _tagController.text,
           description: _descriptionController.text,
         );
-        if (!context.mounted) return;
+        if (!mounted) return;
         ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(content: Text('Team updated successfully')),
+          const SnackBar(content: Text('Team erfolgreich aktualisiert')),
         );
       } else {
         await provider.createTeam(
@@ -52,20 +56,24 @@ class _CreateTeamPageState extends State<CreateTeamPage> {
           tag: _tagController.text,
           description: _descriptionController.text,
         );
-        if (!context.mounted) return;
+        if (!mounted) return;
         ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(content: Text('Team created successfully')),
+          const SnackBar(content: Text('Team erfolgreich erstellt')),
         );
       }
-      if (!context.mounted) return;
+      if (!mounted) return;
       Navigator.pop(context);
     } catch (e) {
-      if (!context.mounted) return;
+      if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('Error: $e')),
+        SnackBar(
+          content: Text(
+            'Fehler: ${e.toString().replaceFirst('Exception: ', '')}',
+          ),
+        ),
       );
     } finally {
-      if (context.mounted) setState(() => _isLoading = false);
+      if (mounted) setState(() => _isLoading = false);
     }
   }
 
@@ -82,7 +90,7 @@ class _CreateTeamPageState extends State<CreateTeamPage> {
     final isEditing = widget.teamToEdit != null;
     return Scaffold(
       appBar: AppBar(
-        title: Text(isEditing ? 'Edit Team' : 'Create Team'),
+        title: Text(isEditing ? 'Team bearbeiten' : 'Team erstellen'),
       ),
       body: SingleChildScrollView(
         padding: const EdgeInsets.all(16.0),
@@ -94,12 +102,12 @@ class _CreateTeamPageState extends State<CreateTeamPage> {
               TextFormField(
                 controller: _nameController,
                 decoration: const InputDecoration(
-                  labelText: 'Team Name',
-                  hintText: 'Enter team name',
+                  labelText: 'Teamname',
+                  hintText: 'Teamname eingeben',
                 ),
                 validator: (value) {
                   if (value == null || value.isEmpty) {
-                    return 'Team name is required';
+                    return 'Der Teamname ist erforderlich';
                   }
                   return null;
                 },
@@ -108,17 +116,17 @@ class _CreateTeamPageState extends State<CreateTeamPage> {
               TextFormField(
                 controller: _tagController,
                 decoration: const InputDecoration(
-                  labelText: 'Team Tag',
-                  hintText: 'Enter team tag (max 3 characters)',
+                  labelText: 'Teamkürzel',
+                  hintText: 'Teamkürzel eingeben (max. 3 Zeichen)',
                 ),
                 maxLength: 3,
                 textCapitalization: TextCapitalization.characters,
                 validator: (value) {
                   if (value == null || value.isEmpty) {
-                    return 'Team tag is required';
+                    return 'Das Teamkürzel ist erforderlich';
                   }
                   if (value.length > 3) {
-                    return 'Tag must be at most 3 characters';
+                    return 'Das Kürzel darf höchstens 3 Zeichen lang sein';
                   }
                   return null;
                 },
@@ -127,8 +135,8 @@ class _CreateTeamPageState extends State<CreateTeamPage> {
               TextFormField(
                 controller: _descriptionController,
                 decoration: const InputDecoration(
-                  labelText: 'Description',
-                  hintText: 'Enter team description (optional)',
+                  labelText: 'Beschreibung',
+                  hintText: 'Teambeschreibung eingeben (optional)',
                 ),
                 maxLines: 3,
               ),
@@ -137,7 +145,7 @@ class _CreateTeamPageState extends State<CreateTeamPage> {
                 onPressed: _isLoading ? null : _submitForm,
                 child: _isLoading
                     ? const CircularProgressIndicator()
-                    : Text(isEditing ? 'Update Team' : 'Create Team'),
+                    : Text(isEditing ? 'Team aktualisieren' : 'Team erstellen'),
               ),
             ],
           ),
diff --git a/frontend_splatournament_manager/lib/pages/create_tournament_page.dart b/frontend_splatournament_manager/lib/pages/create_tournament_page.dart
index 6581127..6169800 100644
--- a/frontend_splatournament_manager/lib/pages/create_tournament_page.dart
+++ b/frontend_splatournament_manager/lib/pages/create_tournament_page.dart
@@ -22,12 +22,13 @@ class _CreateTournamentPageState extends State<CreateTournamentPage> {
 
   bool _isLoading = false;
 
-  final DateFormat _dateFormat = DateFormat('yyyy-MM-dd');
+  final DateFormat _dateFormat = DateFormat('dd.MM.yyyy', 'de_DE');
 
   Future<void> _selectDate(BuildContext context, bool isStart) async {
     final initialDate = DateTime.now();
     final picked = await showDatePicker(
       context: context,
+      locale: const Locale('de', 'DE'),
       initialDate: initialDate,
       firstDate: initialDate,
       lastDate: DateTime(2101),
@@ -47,14 +48,20 @@ class _CreateTournamentPageState extends State<CreateTournamentPage> {
     if (!_formKey.currentState!.validate()) return;
     if (_startDate == null || _endDate == null) {
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('Please select both start and end dates.')),
+        const SnackBar(
+          content: Text(
+            'Bitte wähle sowohl ein Start- als auch ein Enddatum aus.',
+          ),
+        ),
       );
       return;
     }
 
     if (_endDate!.isBefore(_startDate!)) {
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('End date cannot be before start date.')),
+        const SnackBar(
+          content: Text('Das Enddatum darf nicht vor dem Startdatum liegen.'),
+        ),
       );
       return;
     }
@@ -70,15 +77,19 @@ class _CreateTournamentPageState extends State<CreateTournamentPage> {
         _startDate!,
         _endDate!,
       );
-      if (!context.mounted) return;
+      if (!mounted) return;
       Navigator.pop(context);
     } catch (e) {
-      if (!context.mounted) return;
-      ScaffoldMessenger.of(
-        context,
-      ).showSnackBar(SnackBar(content: Text('Error: $e')));
+      if (!mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text(
+            'Fehler: ${e.toString().replaceFirst('Exception: ', '')}',
+          ),
+        ),
+      );
     } finally {
-      if (context.mounted) setState(() => _isLoading = false);
+      if (mounted) setState(() => _isLoading = false);
     }
   }
 
@@ -92,7 +103,7 @@ class _CreateTournamentPageState extends State<CreateTournamentPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: const Text('Create Tournament')),
+      appBar: AppBar(title: const Text('Turnier erstellen')),
       body: SingleChildScrollView(
         padding: const EdgeInsets.all(16.0),
         child: Form(
@@ -104,20 +115,20 @@ class _CreateTournamentPageState extends State<CreateTournamentPage> {
                 controller: _nameController,
                 decoration: const InputDecoration(labelText: 'Name'),
                 validator: (value) =>
-                    value == null || value.isEmpty ? 'Required' : null,
+                    value == null || value.isEmpty ? 'Pflichtfeld' : null,
               ),
               const SizedBox(height: 16),
               TextFormField(
                 controller: _descriptionController,
-                decoration: const InputDecoration(labelText: 'Description'),
+                decoration: const InputDecoration(labelText: 'Beschreibung'),
                 maxLines: 3,
                 validator: (value) =>
-                    value == null || value.isEmpty ? 'Required' : null,
+                    value == null || value.isEmpty ? 'Pflichtfeld' : null,
               ),
               const SizedBox(height: 16),
               DropdownButtonFormField<int>(
                 initialValue: _maxTeamAmount,
-                decoration: const InputDecoration(labelText: 'Max Teams'),
+                decoration: const InputDecoration(labelText: 'Maximale Teams'),
                 items: [2, 4, 8].map((int value) {
                   return DropdownMenuItem<int>(
                     value: value,
@@ -140,7 +151,7 @@ class _CreateTournamentPageState extends State<CreateTournamentPage> {
                       onPressed: () => _selectDate(context, true),
                       child: Text(
                         _startDate == null
-                            ? 'Select Start Date'
+                            ? 'Startdatum wählen'
                             : 'Start: ${_dateFormat.format(_startDate!)}',
                       ),
                     ),
@@ -151,8 +162,8 @@ class _CreateTournamentPageState extends State<CreateTournamentPage> {
                       onPressed: () => _selectDate(context, false),
                       child: Text(
                         _endDate == null
-                            ? 'Select End Date'
-                            : 'End: ${_dateFormat.format(_endDate!)}',
+                            ? 'Enddatum wählen'
+                            : 'Ende: ${_dateFormat.format(_endDate!)}',
                       ),
                     ),
                   ),
@@ -163,7 +174,7 @@ class _CreateTournamentPageState extends State<CreateTournamentPage> {
                 onPressed: _isLoading ? null : _submitForm,
                 child: _isLoading
                     ? const CircularProgressIndicator()
-                    : const Text('Create Tournament'),
+                    : const Text('Turnier erstellen'),
               ),
             ],
           ),
diff --git a/frontend_splatournament_manager/lib/pages/home_page.dart b/frontend_splatournament_manager/lib/pages/home_page.dart
index b1622a7..0327133 100644
--- a/frontend_splatournament_manager/lib/pages/home_page.dart
+++ b/frontend_splatournament_manager/lib/pages/home_page.dart
@@ -42,7 +42,7 @@ class _HomePageState extends State<HomePage>
 
     return Scaffold(
       appBar: AppBar(
-        title: Text(_selectedIndex == 0 ? "Tournaments" : "Teams"),
+        title: Text(_selectedIndex == 0 ? 'Turniere' : 'Teams'),
         bottom: _selectedIndex == 1
             ? TabBar(
                 controller: _tabController,
@@ -54,8 +54,8 @@ class _HomePageState extends State<HomePage>
                   fontWeight: FontWeight.w500,
                 ),
                 tabs: const [
-                  Tab(text: 'All Teams'),
-                  Tab(text: 'My Teams'),
+                  Tab(text: 'Alle Teams'),
+                  Tab(text: 'Meine Teams'),
                 ],
               )
             : null,
@@ -81,7 +81,7 @@ class _HomePageState extends State<HomePage>
                 ScaffoldMessenger.of(context).showSnackBar(
                   SnackBar(
                     content: Text(
-                      'Failed to refresh ${_selectedIndex == 0 ? "tournaments" : "teams"}',
+                      'Aktualisierung der ${_selectedIndex == 0 ? "Turniere" : "Teams"} fehlgeschlagen',
                     ),
                   ),
                 );
@@ -95,7 +95,9 @@ class _HomePageState extends State<HomePage>
             },
             offset: const Offset(0, 48),
             itemBuilder: (context) {
-              return [const PopupMenuItem(value: 1, child: Text("Settings"))];
+              return [
+                const PopupMenuItem(value: 1, child: Text('Einstellungen')),
+              ];
             },
           ),
         ],
@@ -127,7 +129,7 @@ class _HomePageState extends State<HomePage>
         items: const [
           BottomNavigationBarItem(
             icon: Icon(Icons.emoji_events),
-            label: 'Tournaments',
+            label: 'Turniere',
           ),
           BottomNavigationBarItem(icon: Icon(Icons.groups), label: 'Teams'),
         ],
diff --git a/frontend_splatournament_manager/lib/pages/login_page.dart b/frontend_splatournament_manager/lib/pages/login_page.dart
index fbca0ab..6e4e81b 100644
--- a/frontend_splatournament_manager/lib/pages/login_page.dart
+++ b/frontend_splatournament_manager/lib/pages/login_page.dart
@@ -66,13 +66,13 @@ class _LoginPageState extends State<LoginPage> {
                   TextFormField(
                     controller: _usernameController,
                     decoration: const InputDecoration(
-                      labelText: 'Username',
+                      labelText: 'Benutzername',
                       prefixIcon: Icon(Icons.person),
                       border: OutlineInputBorder(),
                     ),
                     validator: (value) {
                       if (value == null || value.trim().isEmpty) {
-                        return 'Please enter a username';
+                        return 'Bitte gib einen Benutzernamen ein';
                       }
                       return null;
                     },
@@ -82,16 +82,16 @@ class _LoginPageState extends State<LoginPage> {
                     controller: _passwordController,
                     obscureText: true,
                     decoration: const InputDecoration(
-                      labelText: 'Password',
+                      labelText: 'Passwort',
                       prefixIcon: Icon(Icons.lock),
                       border: OutlineInputBorder(),
                     ),
                     validator: (value) {
                       if (value == null || value.trim().isEmpty) {
-                        return 'Please enter a password';
+                        return 'Bitte gib ein Passwort ein';
                       }
                       if (_isRegistering && value.trim().length < 4) {
-                        return 'Password must be at least 6 characters';
+                        return 'Das Passwort muss mindestens 4 Zeichen lang sein';
                       }
                       return null;
                     },
@@ -124,9 +124,13 @@ class _LoginPageState extends State<LoginPage> {
                             ? const SizedBox(
                                 height: 20,
                                 width: 20,
-                                child: CircularProgressIndicator(strokeWidth: 2),
+                                child: CircularProgressIndicator(
+                                  strokeWidth: 2,
+                                ),
                               )
-                            : Text(_isRegistering ? 'Register' : 'Login'),
+                            : Text(
+                                _isRegistering ? 'Registrieren' : 'Anmelden',
+                              ),
                       );
                     },
                   ),
@@ -141,8 +145,8 @@ class _LoginPageState extends State<LoginPage> {
                     },
                     child: Text(
                       _isRegistering
-                          ? 'Already have an account? Login'
-                          : 'Don\'t have an account? Register',
+                          ? 'Bereits ein Konto? Anmelden'
+                          : 'Noch kein Konto? Registrieren',
                     ),
                   ),
                 ],
@@ -154,4 +158,3 @@ class _LoginPageState extends State<LoginPage> {
     );
   }
 }
-
diff --git a/frontend_splatournament_manager/lib/pages/settings_page.dart b/frontend_splatournament_manager/lib/pages/settings_page.dart
index c4f17b4..6948343 100644
--- a/frontend_splatournament_manager/lib/pages/settings_page.dart
+++ b/frontend_splatournament_manager/lib/pages/settings_page.dart
@@ -17,11 +17,11 @@ class _SettingsPageState extends State<SettingsPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: Text("Splatournament")),
+      appBar: AppBar(title: const Text('Einstellungen')),
       body: Column(
         children: [
-          SizedBox(height: 24),
-          ProfileWidget(),
+          const SizedBox(height: 24),
+          const ProfileWidget(),
           Column(
             mainAxisSize: MainAxisSize.min,
             children: [
@@ -29,7 +29,7 @@ class _SettingsPageState extends State<SettingsPage> {
               ListTile(
                 leading: const Icon(Icons.logout, color: Colors.red),
                 title: const Text(
-                  'Sign Out',
+                  'Abmelden',
                   style: TextStyle(color: Colors.red),
                 ),
                 onTap: () {
diff --git a/frontend_splatournament_manager/lib/pages/tournament_bracket_page.dart b/frontend_splatournament_manager/lib/pages/tournament_bracket_page.dart
index 752e6d7..da8b041 100644
--- a/frontend_splatournament_manager/lib/pages/tournament_bracket_page.dart
+++ b/frontend_splatournament_manager/lib/pages/tournament_bracket_page.dart
@@ -35,13 +35,19 @@ class _TournamentBracketPageState extends State<TournamentBracketPage> {
       if (mounted) {
         setState(() {});
         ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(content: Text('Bracket initialized successfully')),
+          const SnackBar(
+            content: Text('Turnierbaum erfolgreich initialisiert'),
+          ),
         );
       }
     } catch (e) {
       if (mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(content: Text('Failed to initialize bracket: $e')),
+          SnackBar(
+            content: Text(
+              'Initialisierung des Turnierbaums fehlgeschlagen: ${e.toString().replaceFirst('Exception: ', '')}',
+            ),
+          ),
         );
       }
     }
@@ -51,7 +57,7 @@ class _TournamentBracketPageState extends State<TournamentBracketPage> {
     final result = await showDialog<int>(
       context: context,
       builder: (context) => AlertDialog(
-        title: const Text('Select Winner'),
+        title: const Text('Sieger auswählen'),
         content: Column(
           mainAxisSize: MainAxisSize.min,
           children: [
@@ -69,11 +75,11 @@ class _TournamentBracketPageState extends State<TournamentBracketPage> {
           if (match.hasWinner)
             TextButton(
               onPressed: () => Navigator.pop(context, -1), // Reset signal
-              child: const Text('Reset'),
+              child: const Text('Zurücksetzen'),
             ),
           TextButton(
             onPressed: () => Navigator.pop(context),
-            child: const Text('Cancel'),
+            child: const Text('Abbrechen'),
           ),
         ],
       ),
@@ -91,14 +97,22 @@ class _TournamentBracketPageState extends State<TournamentBracketPage> {
         if (mounted) {
           ScaffoldMessenger.of(context).showSnackBar(
             SnackBar(
-              content: Text(result == -1 ? 'Match reset' : 'Winner set successfully'),
+              content: Text(
+                result == -1
+                    ? 'Match zurückgesetzt'
+                    : 'Sieger erfolgreich festgelegt',
+              ),
             ),
           );
         }
       } catch (e) {
         if (mounted) {
           ScaffoldMessenger.of(context).showSnackBar(
-            SnackBar(content: Text('Error: $e')),
+            SnackBar(
+              content: Text(
+                'Fehler: ${e.toString().replaceFirst('Exception: ', '')}',
+              ),
+            ),
           );
         }
       }
@@ -122,7 +136,11 @@ class _TournamentBracketPageState extends State<TournamentBracketPage> {
             return const Center(child: CircularProgressIndicator());
           }
           if (snapshot.hasError) {
-            return Center(child: Text('Error: ${snapshot.error}'));
+            return Center(
+              child: Text(
+                'Fehler: ${snapshot.error.toString().replaceFirst('Exception: ', '')}',
+              ),
+            );
           }
 
           final teams = snapshot.data![0] as List<Team>;
@@ -135,19 +153,19 @@ class _TournamentBracketPageState extends State<TournamentBracketPage> {
                 mainAxisAlignment: MainAxisAlignment.center,
                 children: [
                   const Text(
-                    'Bracket not initialized yet',
+                    'Der Turnierbaum wurde noch nicht initialisiert',
                     style: TextStyle(fontSize: 18),
                   ),
                   const SizedBox(height: 16),
                   ElevatedButton(
                     onPressed: teams.length >= 2 ? _initializeBracket : null,
-                    child: const Text('Initialize Bracket'),
+                    child: const Text('Turnierbaum initialisieren'),
                   ),
                   if (teams.length < 2)
                     const Padding(
                       padding: EdgeInsets.only(top: 8),
                       child: Text(
-                        'Need at least 2 teams',
+                        'Mindestens 2 Teams erforderlich',
                         style: TextStyle(color: Colors.red),
                       ),
                     ),
@@ -208,11 +226,11 @@ class _BracketBoard extends StatelessWidget {
   });
 
   String _roundLabel(int round) {
-    if (round == roundCount - 1) return 'Winner';
+    if (round == roundCount - 1) return 'Sieger';
     final teamsInRound = bracketSize ~/ (1 << round);
-    if (teamsInRound == 2) return 'Final';
-    if (teamsInRound == 4) return 'Semi-finals';
-    return 'Quarter-finals';
+    if (teamsInRound == 2) return 'Finale';
+    if (teamsInRound == 4) return 'Halbfinale';
+    return 'Viertelfinale';
   }
 
   double _cardTop(int round, int index) {
@@ -273,7 +291,7 @@ class _BracketBoard extends StatelessWidget {
       // Match cards
       for (int i = 0; i < cardsInRound; i++) {
         final match = _findMatch(round, i);
-        
+
         children.add(
           Positioned(
             left: left,
@@ -292,14 +310,14 @@ class _BracketBoard extends StatelessWidget {
                       }
                     }
                   : match != null && match.hasWinner
-                      ? () {
-                          final team1 = teamMap[match.team1Id];
-                          final team2 = teamMap[match.team2Id];
-                          if (team1 != null && team2 != null) {
-                            onMatchTap(match, team1, team2);
-                          }
-                        }
-                      : null,
+                  ? () {
+                      final team1 = teamMap[match.team1Id];
+                      final team2 = teamMap[match.team2Id];
+                      if (team1 != null && team2 != null) {
+                        onMatchTap(match, team1, team2);
+                      }
+                    }
+                  : null,
             ),
           ),
         );
@@ -376,11 +394,7 @@ class _MatchCard extends StatelessWidget {
   final Map<int, Team> teamMap;
   final VoidCallback? onTap;
 
-  const _MatchCard({
-    this.match,
-    required this.teamMap,
-    this.onTap,
-  });
+  const _MatchCard({this.match, required this.teamMap, this.onTap});
 
   @override
   Widget build(BuildContext context) {
@@ -430,7 +444,7 @@ class _MatchCard extends StatelessWidget {
                 ),
                 const SizedBox(height: 4),
                 Text(
-                  'vs',
+                  'vs.',
                   style: TextStyle(
                     fontSize: 10,
                     color: colorScheme.onSurface.withValues(alpha: 0.6),
diff --git a/frontend_splatournament_manager/lib/pages/tournament_detail_page.dart b/frontend_splatournament_manager/lib/pages/tournament_detail_page.dart
index 0511535..f3450a5 100644
--- a/frontend_splatournament_manager/lib/pages/tournament_detail_page.dart
+++ b/frontend_splatournament_manager/lib/pages/tournament_detail_page.dart
@@ -3,8 +3,15 @@ import 'package:frontend_splatournament_manager/models/team.dart';
 import 'package:frontend_splatournament_manager/models/tournament.dart';
 import 'package:frontend_splatournament_manager/pages/tournament_bracket_page.dart';
 import 'package:frontend_splatournament_manager/providers/team_provider.dart';
+import 'package:intl/intl.dart';
 import 'package:provider/provider.dart';
 
+final DateFormat _tournamentDateFormat = DateFormat('dd.MM.yyyy', 'de_DE');
+
+String _formatTournamentDate(String value) {
+  return _tournamentDateFormat.format(DateTime.parse(value));
+}
+
 class TournamentDetailPage extends StatefulWidget {
   final Tournament tournament;
 
@@ -29,7 +36,7 @@ class _TournamentDetailPageState extends State<TournamentDetailPage> {
         ScaffoldMessenger.of(context).showSnackBar(
           const SnackBar(
             content: Text(
-              'You are not a member of any team. Join or create a team first!',
+              'Du bist in keinem Team. Tritt zuerst einem Team bei oder erstelle eines.',
             ),
           ),
         );
@@ -40,7 +47,7 @@ class _TournamentDetailPageState extends State<TournamentDetailPage> {
         context: context,
         builder: (BuildContext dialogContext) {
           return AlertDialog(
-            title: const Text('Select Your Team'),
+            title: const Text('Team auswählen'),
             content: SizedBox(
               width: double.maxFinite,
               child: ListView.builder(
@@ -62,7 +69,7 @@ class _TournamentDetailPageState extends State<TournamentDetailPage> {
             actions: [
               TextButton(
                 onPressed: () => Navigator.pop(dialogContext),
-                child: const Text('Cancel'),
+                child: const Text('Abbrechen'),
               ),
             ],
           );
@@ -80,7 +87,9 @@ class _TournamentDetailPageState extends State<TournamentDetailPage> {
 
           ScaffoldMessenger.of(context).showSnackBar(
             SnackBar(
-              content: Text('${selectedTeam.name} joined the tournament!'),
+              content: Text(
+                '${selectedTeam.name} wurde für das Turnier angemeldet.',
+              ),
             ),
           );
 
@@ -93,7 +102,7 @@ class _TournamentDetailPageState extends State<TournamentDetailPage> {
           ScaffoldMessenger.of(context).showSnackBar(
             SnackBar(
               content: Text(
-                'Failed to join: ${e.toString().replaceAll('Exception: ', '')}',
+                'Anmeldung fehlgeschlagen: ${e.toString().replaceAll('Exception: ', '')}',
               ),
             ),
           );
@@ -101,9 +110,13 @@ class _TournamentDetailPageState extends State<TournamentDetailPage> {
       }
     } catch (e) {
       if (!context.mounted) return;
-      ScaffoldMessenger.of(
-        context,
-      ).showSnackBar(SnackBar(content: Text('Failed to load your teams: $e')));
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text(
+            'Deine Teams konnten nicht geladen werden: ${e.toString().replaceFirst('Exception: ', '')}',
+          ),
+        ),
+      );
     }
   }
 
@@ -161,10 +174,10 @@ class _TournamentDetailPageState extends State<TournamentDetailPage> {
                     : null,
                 child: Text(
                   widget.tournament.isRegistrationFuture
-                      ? "Registration not open yet"
+                      ? 'Anmeldung noch nicht geöffnet'
                       : widget.tournament.isRegistrationPast
-                      ? "Registration closed"
-                      : "Join with Team",
+                      ? 'Anmeldung geschlossen'
+                      : 'Mit Team anmelden',
                 ),
               ),
             ),
@@ -205,7 +218,7 @@ class _TournamentTeamsWidgetState extends State<TournamentTeamsWidget> {
           Padding(
             padding: const EdgeInsets.fromLTRB(16, 12, 16, 4),
             child: Text(
-              'Registered Teams',
+              'Angemeldete Teams',
               style: TextStyle(fontWeight: FontWeight.w600, fontSize: 17),
             ),
           ),
@@ -217,11 +230,17 @@ class _TournamentTeamsWidgetState extends State<TournamentTeamsWidget> {
                   return Center(child: CircularProgressIndicator());
                 }
                 if (snapshot.hasError) {
-                  return Center(child: Text('Error: ${snapshot.error}'));
+                  return Center(
+                    child: Text(
+                      'Fehler: ${snapshot.error.toString().replaceFirst('Exception: ', '')}',
+                    ),
+                  );
                 }
                 final teams = snapshot.data ?? [];
                 if (teams.isEmpty) {
-                  return Center(child: Text('No teams registered yet.'));
+                  return const Center(
+                    child: Text('Noch keine Teams angemeldet.'),
+                  );
                 }
                 return ListView.builder(
                   itemCount: teams.length,
@@ -257,7 +276,9 @@ class _TournamentTeamsWidgetState extends State<TournamentTeamsWidget> {
                             if (!context.mounted) return;
                             ScaffoldMessenger.of(context).showSnackBar(
                               SnackBar(
-                                content: Text('Failed to remove team: $e'),
+                                content: Text(
+                                  'Team konnte nicht entfernt werden: ${e.toString().replaceFirst('Exception: ', '')}',
+                                ),
                               ),
                             );
                           }
@@ -282,6 +303,9 @@ class TournamentContentWidget extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final registrationPeriod =
+        '${_formatTournamentDate(tournament.registrationStartDate)} - ${_formatTournamentDate(tournament.registrationEndDate)}';
+
     return Expanded(
       child: Column(
         children: [
@@ -300,24 +324,22 @@ class TournamentContentWidget extends StatelessWidget {
                   crossAxisAlignment: CrossAxisAlignment.start,
                   children: [
                     Text(
-                      "Registration Period",
+                      'Anmeldezeitraum',
                       style: TextStyle(
                         fontWeight: FontWeight.w600,
                         fontSize: 17,
                       ),
                     ),
-                    Text(
-                      "${tournament.registrationStartDate} - ${tournament.registrationEndDate}",
-                    ),
+                    Text(registrationPeriod),
                     SizedBox(height: 24),
                     Text(
-                      "Format",
+                      'Format',
                       style: TextStyle(
                         fontWeight: FontWeight.w600,
                         fontSize: 17,
                       ),
                     ),
-                    Text("Single Elimination"),
+                    const Text('Einfaches K.-o.-System'),
                     Spacer(),
                     SizedBox(
                       width: double.infinity,
@@ -331,7 +353,7 @@ class TournamentContentWidget extends StatelessWidget {
                             ),
                           );
                         },
-                        child: Text("View ongoing"),
+                        child: const Text('Turnierbaum ansehen'),
                       ),
                     ),
                   ],
@@ -382,7 +404,7 @@ class DetailHeader extends StatelessWidget {
                 InputChip(
                   onPressed: () => onTeamsChipClicked(),
                   label: Text(
-                    "${tournament.currentTeamAmount} out of ${tournament.maxTeamAmount} Teams",
+                    '${tournament.currentTeamAmount} von ${tournament.maxTeamAmount} Teams',
                   ),
                 ),
               ],
diff --git a/frontend_splatournament_manager/lib/providers/match_provider.dart b/frontend_splatournament_manager/lib/providers/match_provider.dart
index 8ec77ee..f479f6c 100644
--- a/frontend_splatournament_manager/lib/providers/match_provider.dart
+++ b/frontend_splatournament_manager/lib/providers/match_provider.dart
@@ -7,20 +7,27 @@ import 'package:frontend_splatournament_manager/services/api_client.dart';
 
 class MatchProvider extends ChangeNotifier {
   Future<void> initializeBracket(int tournamentId) async {
-    final response = await ApiClient.post('/tournaments/$tournamentId/bracket', {});
-    
+    final response = await ApiClient.post(
+      '/tournaments/$tournamentId/bracket',
+      {},
+    );
+
     if (response.statusCode != HttpStatus.created) {
-      throw Exception('Failed to initialize bracket (${response.statusCode})');
+      throw Exception(
+        'Turnierbaum konnte nicht initialisiert werden (${response.statusCode})',
+      );
     }
-    
+
     notifyListeners();
   }
 
   Future<List<Match>> getMatchesByTournament(int tournamentId) async {
     final response = await ApiClient.get('/tournaments/$tournamentId/matches');
-    
+
     if (response.statusCode != HttpStatus.ok) {
-      throw Exception('Failed to load matches (${response.statusCode})');
+      throw Exception(
+        'Matches konnten nicht geladen werden (${response.statusCode})',
+      );
     }
 
     final List<dynamic> list = json.decode(response.body);
@@ -34,9 +41,11 @@ class MatchProvider extends ChangeNotifier {
 
     if (response.statusCode != HttpStatus.ok) {
       final error = json.decode(response.body);
-      throw Exception(error['error'] ?? 'Failed to set winner');
+      throw Exception(
+        error['error'] ?? 'Sieger konnte nicht festgelegt werden',
+      );
     }
-    
+
     notifyListeners();
   }
 
@@ -44,9 +53,11 @@ class MatchProvider extends ChangeNotifier {
     final response = await ApiClient.delete('/matches/$matchId/winner');
 
     if (response.statusCode != HttpStatus.ok) {
-      throw Exception('Failed to reset match (${response.statusCode})');
+      throw Exception(
+        'Match konnte nicht zurückgesetzt werden (${response.statusCode})',
+      );
     }
-    
+
     notifyListeners();
   }
 }
diff --git a/frontend_splatournament_manager/lib/providers/tournament_provider.dart b/frontend_splatournament_manager/lib/providers/tournament_provider.dart
index 7cfcc94..9a91cee 100644
--- a/frontend_splatournament_manager/lib/providers/tournament_provider.dart
+++ b/frontend_splatournament_manager/lib/providers/tournament_provider.dart
@@ -6,7 +6,6 @@ import 'package:frontend_splatournament_manager/models/tournament.dart';
 import 'package:frontend_splatournament_manager/services/api_client.dart';
 
 class TournamentProvider extends ChangeNotifier {
-
   List<Tournament> _availableTournaments = [];
   Future<List<Tournament>>? _initialLoadFuture;
 
@@ -15,7 +14,9 @@ class TournamentProvider extends ChangeNotifier {
   Future<List<Tournament>> _fetchTournaments() async {
     final response = await ApiClient.get('/tournaments');
     if (response.statusCode != HttpStatus.ok) {
-      throw Exception('Failed to load tournaments (${response.statusCode})');
+      throw Exception(
+        'Turniere konnten nicht geladen werden (${response.statusCode})',
+      );
     }
 
     final List<dynamic> list = json.decode(response.body);
@@ -45,19 +46,22 @@ class TournamentProvider extends ChangeNotifier {
     DateTime registrationStartDate,
     DateTime registrationEndDate,
   ) async {
-    final response = await ApiClient.post(
-      '/tournaments',
-      {
-        'name': name,
-        'description': description,
-        'maxTeamAmount': maxTeamAmount,
-        'registrationStartDate': registrationStartDate.toIso8601String().split('T')[0],
-        'registrationEndDate': registrationEndDate.toIso8601String().split('T')[0],
-      },
-    );
+    final response = await ApiClient.post('/tournaments', {
+      'name': name,
+      'description': description,
+      'maxTeamAmount': maxTeamAmount,
+      'registrationStartDate': registrationStartDate.toIso8601String().split(
+        'T',
+      )[0],
+      'registrationEndDate': registrationEndDate.toIso8601String().split(
+        'T',
+      )[0],
+    });
 
     if (response.statusCode != HttpStatus.created) {
-      throw Exception('Failed to create tournament (${response.statusCode})');
+      throw Exception(
+        'Turnier konnte nicht erstellt werden (${response.statusCode})',
+      );
     }
 
     await refreshAvailableTournaments();
diff --git a/frontend_splatournament_manager/lib/services/auth_service.dart b/frontend_splatournament_manager/lib/services/auth_service.dart
index 9822cb8..ba9f07e 100644
--- a/frontend_splatournament_manager/lib/services/auth_service.dart
+++ b/frontend_splatournament_manager/lib/services/auth_service.dart
@@ -4,7 +4,10 @@ import 'package:http/http.dart' as http;
 
 class AuthService {
   final String baseUrl = SplatournamentApp.baseUrl;
-  Future<Map<String, dynamic>> register(String username, String password) async {
+  Future<Map<String, dynamic>> register(
+    String username,
+    String password,
+  ) async {
     final response = await http.post(
       Uri.parse('$baseUrl/register'),
       headers: {'Content-Type': 'application/json'},
@@ -15,7 +18,7 @@ class AuthService {
       return json.decode(response.body);
     } else {
       final body = json.decode(response.body);
-      throw Exception(body['error'] ?? 'Registration failed');
+      throw Exception(body['error'] ?? 'Registrierung fehlgeschlagen');
     }
   }
 
@@ -30,8 +33,7 @@ class AuthService {
       return json.decode(response.body);
     } else {
       final body = json.decode(response.body);
-      throw Exception(body['error'] ?? 'Login failed');
+      throw Exception(body['error'] ?? 'Anmeldung fehlgeschlagen');
     }
   }
 }
-
diff --git a/frontend_splatournament_manager/lib/services/team_service.dart b/frontend_splatournament_manager/lib/services/team_service.dart
index c72ce31..03971ba 100644
--- a/frontend_splatournament_manager/lib/services/team_service.dart
+++ b/frontend_splatournament_manager/lib/services/team_service.dart
@@ -5,11 +5,12 @@ import 'package:frontend_splatournament_manager/models/team.dart';
 import 'package:frontend_splatournament_manager/services/api_client.dart';
 
 class TeamService {
-
   Future<List<Team>> getAllTeams() async {
     final response = await ApiClient.get('/teams');
     if (response.statusCode != HttpStatus.ok) {
-      throw Exception('Failed to load teams (${response.statusCode})');
+      throw Exception(
+        'Teams konnten nicht geladen werden (${response.statusCode})',
+      );
     }
     final List<dynamic> list = json.decode(response.body);
     return list.map((j) => Team.fromJson(j as Map<String, dynamic>)).toList();
@@ -18,10 +19,12 @@ class TeamService {
   Future<Team> getTeamById(int id) async {
     final response = await ApiClient.get('/teams/$id');
     if (response.statusCode == HttpStatus.notFound) {
-      throw Exception('Team not found');
+      throw Exception('Team nicht gefunden');
     }
     if (response.statusCode != HttpStatus.ok) {
-      throw Exception('Failed to load team (${response.statusCode})');
+      throw Exception(
+        'Team konnte nicht geladen werden (${response.statusCode})',
+      );
     }
     return Team.fromJson(json.decode(response.body) as Map<String, dynamic>);
   }
@@ -31,13 +34,14 @@ class TeamService {
     required String tag,
     String description = '',
   }) async {
-    final response = await ApiClient.post(
-      '/teams',
-      {'name': name, 'tag': tag, 'description': description},
-    );
+    final response = await ApiClient.post('/teams', {
+      'name': name,
+      'tag': tag,
+      'description': description,
+    });
     if (response.statusCode != HttpStatus.created) {
       final body = json.decode(response.body);
-      throw Exception(body['error'] ?? 'Failed to create team');
+      throw Exception(body['error'] ?? 'Team konnte nicht erstellt werden');
     }
     return Team.fromJson(json.decode(response.body) as Map<String, dynamic>);
   }
@@ -48,17 +52,14 @@ class TeamService {
     String? tag,
     String? description,
   }) async {
-    final response = await ApiClient.put(
-      '/teams/$id',
-      {
-        if (name != null) 'name': name,
-        if (tag != null) 'tag': tag,
-        if (description != null) 'description': description,
-      },
-    );
+    final response = await ApiClient.put('/teams/$id', {
+      'name': name,
+      'tag': tag,
+      'description': description,
+    });
     if (response.statusCode != HttpStatus.ok) {
       final body = json.decode(response.body);
-      throw Exception(body['error'] ?? 'Failed to update team');
+      throw Exception(body['error'] ?? 'Team konnte nicht aktualisiert werden');
     }
   }
 
@@ -66,7 +67,7 @@ class TeamService {
     final response = await ApiClient.delete('/teams/$id');
     if (response.statusCode != HttpStatus.ok) {
       final body = json.decode(response.body);
-      throw Exception(body['error'] ?? 'Failed to delete team');
+      throw Exception(body['error'] ?? 'Team konnte nicht gelöscht werden');
     }
   }
 
@@ -74,7 +75,7 @@ class TeamService {
     final response = await ApiClient.get('/tournaments/$tournamentId/teams');
     if (response.statusCode != HttpStatus.ok) {
       throw Exception(
-        'Failed to load teams for tournament (${response.statusCode})',
+        'Teams für das Turnier konnten nicht geladen werden (${response.statusCode})',
       );
     }
     final List<dynamic> list = json.decode(response.body);
@@ -82,24 +83,29 @@ class TeamService {
   }
 
   Future<void> registerTeamForTournament(int tournamentId, int teamId) async {
-    final response = await ApiClient.post(
-      '/tournaments/$tournamentId/teams',
-      {'teamId': teamId},
-    );
+    final response = await ApiClient.post('/tournaments/$tournamentId/teams', {
+      'teamId': teamId,
+    });
     if (response.statusCode == 409) {
-      throw Exception('Team is already registered for this tournament');
+      throw Exception('Das Team ist bereits für dieses Turnier angemeldet');
     }
     if (response.statusCode != HttpStatus.created) {
       final body = json.decode(response.body);
-      throw Exception(body['error'] ?? 'Failed to register team');
+      throw Exception(
+        body['error'] ?? 'Team konnte nicht für das Turnier angemeldet werden',
+      );
     }
   }
 
   Future<void> removeTeamFromTournament(int tournamentId, int teamId) async {
-    final response = await ApiClient.delete('/tournaments/$tournamentId/teams/$teamId');
+    final response = await ApiClient.delete(
+      '/tournaments/$tournamentId/teams/$teamId',
+    );
     if (response.statusCode != HttpStatus.ok) {
       final body = json.decode(response.body);
-      throw Exception(body['error'] ?? 'Failed to remove team from tournament');
+      throw Exception(
+        body['error'] ?? 'Team konnte nicht aus dem Turnier entfernt werden',
+      );
     }
   }
 
@@ -107,7 +113,7 @@ class TeamService {
     final response = await ApiClient.get('/teams/$teamId/tournaments');
     if (response.statusCode != HttpStatus.ok) {
       throw Exception(
-        'Failed to load tournaments for team (${response.statusCode})',
+        'Turniere für das Team konnten nicht geladen werden (${response.statusCode})',
       );
     }
     final List<dynamic> list = json.decode(response.body);
@@ -117,7 +123,9 @@ class TeamService {
   Future<List<Team>> getUserTeams() async {
     final response = await ApiClient.get('/users/me/teams');
     if (response.statusCode != HttpStatus.ok) {
-      throw Exception('Failed to load user teams (${response.statusCode})');
+      throw Exception(
+        'Eigene Teams konnten nicht geladen werden (${response.statusCode})',
+      );
     }
     final List<dynamic> list = json.decode(response.body);
     return list.map((j) => Team.fromJson(j as Map<String, dynamic>)).toList();
@@ -126,11 +134,11 @@ class TeamService {
   Future<void> joinTeam(int teamId) async {
     final response = await ApiClient.post('/teams/$teamId/members', {});
     if (response.statusCode == 409) {
-      throw Exception('You are already a member of this team');
+      throw Exception('Du bist bereits Mitglied dieses Teams');
     }
     if (response.statusCode != HttpStatus.created) {
       final body = json.decode(response.body);
-      throw Exception(body['error'] ?? 'Failed to join team');
+      throw Exception(body['error'] ?? 'Beitritt zum Team fehlgeschlagen');
     }
   }
 
@@ -138,14 +146,16 @@ class TeamService {
     final response = await ApiClient.delete('/teams/$teamId/members/me');
     if (response.statusCode != HttpStatus.ok) {
       final body = json.decode(response.body);
-      throw Exception(body['error'] ?? 'Failed to leave team');
+      throw Exception(body['error'] ?? 'Team konnte nicht verlassen werden');
     }
   }
 
   Future<List<Map<String, dynamic>>> getTeamMembers(int teamId) async {
     final response = await ApiClient.get('/teams/$teamId/members');
     if (response.statusCode != HttpStatus.ok) {
-      throw Exception('Failed to load team members (${response.statusCode})');
+      throw Exception(
+        'Teammitglieder konnten nicht geladen werden (${response.statusCode})',
+      );
     }
     final List<dynamic> list = json.decode(response.body);
     return list.cast<Map<String, dynamic>>();
diff --git a/frontend_splatournament_manager/lib/widgets/available_tournament_list.dart b/frontend_splatournament_manager/lib/widgets/available_tournament_list.dart
index 9b0648f..cbd8375 100644
--- a/frontend_splatournament_manager/lib/widgets/available_tournament_list.dart
+++ b/frontend_splatournament_manager/lib/widgets/available_tournament_list.dart
@@ -13,7 +13,7 @@ class AvailableTournamentList extends StatelessWidget {
       padding: EdgeInsets.fromLTRB(24, 0, 24, 0),
       child: Column(
         children: [
-          Row(children: [Text("Available Tournaments")]),
+          const Row(children: [Text('Verfügbare Turniere')]),
           SizedBox(
             width: double.infinity,
             height: 350,
@@ -40,18 +40,21 @@ class TournamentListFutureBuilder extends StatelessWidget {
       future: provider.ensureTournamentsLoaded(),
       builder: (context, snapshot) {
         final list = provider.availableTournaments;
-        print(list);
         if (snapshot.connectionState == ConnectionState.waiting &&
             list.isEmpty) {
           return Center(child: CircularProgressIndicator());
         }
 
         if (snapshot.hasError && list.isEmpty) {
-          return Center(child: Text('Error: ${snapshot.error}'));
+          return Center(
+            child: Text(
+              'Fehler: ${snapshot.error.toString().replaceFirst('Exception: ', '')}',
+            ),
+          );
         }
 
         if (list.isEmpty) {
-          return Center(child: Text('No tournaments found'));
+          return const Center(child: Text('Keine Turniere gefunden'));
         }
 
         return ListView.builder(
diff --git a/frontend_splatournament_manager/lib/widgets/my_teams_widget.dart b/frontend_splatournament_manager/lib/widgets/my_teams_widget.dart
index 9ee756b..87f49f6 100644
--- a/frontend_splatournament_manager/lib/widgets/my_teams_widget.dart
+++ b/frontend_splatournament_manager/lib/widgets/my_teams_widget.dart
@@ -20,7 +20,10 @@ class _MyTeamsWidgetState extends State<MyTeamsWidget> {
   }
 
   void _loadMyTeams() {
-    _myTeamsFuture = Provider.of<TeamProvider>(context, listen: false).getUserTeams();
+    _myTeamsFuture = Provider.of<TeamProvider>(
+      context,
+      listen: false,
+    ).getUserTeams();
   }
 
   @override
@@ -33,13 +36,19 @@ class _MyTeamsWidgetState extends State<MyTeamsWidget> {
         }
 
         if (snapshot.hasError) {
-          return Center(child: Text('Error: ${snapshot.error}'));
+          return Center(
+            child: Text(
+              'Fehler: ${snapshot.error.toString().replaceFirst('Exception: ', '')}',
+            ),
+          );
         }
 
         final teams = snapshot.data ?? [];
         if (teams.isEmpty) {
           return const Center(
-            child: Text('You are not in any teams yet\nJoin teams from the All Teams tab'),
+            child: Text(
+              'Du bist noch in keinem Team.\nTritt einem Team im Tab Alle Teams bei.',
+            ),
           );
         }
 
@@ -53,11 +62,13 @@ class _MyTeamsWidgetState extends State<MyTeamsWidget> {
   }
 
   Widget _buildTeamCard(Team team) {
-    final memberCountText = team.memberCount != null 
-        ? '${team.memberCount}/4 members'
-        : 'No members';
-    final description = team.description.isEmpty ? 'No description' : team.description;
-    
+    final memberCountText = team.memberCount != null
+        ? '${team.memberCount}/4 Mitglieder'
+        : 'Keine Mitglieder';
+    final description = team.description.isEmpty
+        ? 'Keine Beschreibung'
+        : team.description;
+
     return Card(
       margin: const EdgeInsets.only(bottom: 12),
       child: ListTile(
@@ -79,16 +90,16 @@ class _MyTeamsWidgetState extends State<MyTeamsWidget> {
     final confirmed = await showDialog<bool>(
       context: context,
       builder: (context) => AlertDialog(
-        title: const Text('Leave Team?'),
-        content: Text('Leave "${team.name}"?'),
+        title: const Text('Team verlassen?'),
+        content: Text('Soll "${team.name}" verlassen werden?'),
         actions: [
           TextButton(
             onPressed: () => Navigator.pop(context, false),
-            child: const Text('Cancel'),
+            child: const Text('Abbrechen'),
           ),
           TextButton(
             onPressed: () => Navigator.pop(context, true),
-            child: const Text('Leave', style: TextStyle(color: Colors.red)),
+            child: const Text('Verlassen', style: TextStyle(color: Colors.red)),
           ),
         ],
       ),
@@ -96,18 +107,25 @@ class _MyTeamsWidgetState extends State<MyTeamsWidget> {
 
     if (confirmed == true && mounted) {
       try {
-        await Provider.of<TeamProvider>(context, listen: false).leaveTeam(team.id);
+        await Provider.of<TeamProvider>(
+          context,
+          listen: false,
+        ).leaveTeam(team.id);
         if (mounted) {
-          ScaffoldMessenger.of(context).showSnackBar(
-            const SnackBar(content: Text('Left team')),
-          );
+          ScaffoldMessenger.of(
+            context,
+          ).showSnackBar(const SnackBar(content: Text('Team verlassen')));
           _loadMyTeams();
           setState(() {});
         }
       } catch (e) {
         if (mounted) {
           ScaffoldMessenger.of(context).showSnackBar(
-            SnackBar(content: Text('Error: $e')),
+            SnackBar(
+              content: Text(
+                'Fehler: ${e.toString().replaceFirst('Exception: ', '')}',
+              ),
+            ),
           );
         }
       }
diff --git a/frontend_splatournament_manager/lib/widgets/my_tournaments_carousel.dart b/frontend_splatournament_manager/lib/widgets/my_tournaments_carousel.dart
index 3be7ded..c5fa1ad 100644
--- a/frontend_splatournament_manager/lib/widgets/my_tournaments_carousel.dart
+++ b/frontend_splatournament_manager/lib/widgets/my_tournaments_carousel.dart
@@ -38,7 +38,7 @@ class _MyTournamentsCarouselState extends State<MyTournamentsCarousel> {
               const Padding(
                 padding: EdgeInsets.fromLTRB(16, 16, 16, 8),
                 child: Text(
-                  'My Tournaments',
+                  'Meine Turniere',
                   style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
                 ),
               ),
@@ -58,7 +58,7 @@ class _MyTournamentsCarouselState extends State<MyTournamentsCarousel> {
                         ),
                         const SizedBox(height: 8),
                         const Text(
-                          'No tournaments found',
+                          'Keine Turniere gefunden',
                           style: TextStyle(fontSize: 16, color: Colors.grey),
                         ),
                       ],
@@ -77,7 +77,7 @@ class _MyTournamentsCarouselState extends State<MyTournamentsCarousel> {
             const Padding(
               padding: EdgeInsets.fromLTRB(16, 16, 16, 8),
               child: Text(
-                'My Tournaments',
+                'Meine Turniere',
                 style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
               ),
             ),
@@ -162,13 +162,13 @@ class _TournamentCard extends StatelessWidget {
                   const SizedBox(width: 4),
                   Text(
                     tournament.isRegistrationOpen
-                        ? 'Registration Open'
-                        : 'Registration Closed',
+                        ? 'Anmeldung offen'
+                        : 'Anmeldung geschlossen',
                     style: const TextStyle(fontSize: 14),
                   ),
                   const Spacer(),
                   Text(
-                    '${tournament.currentTeamAmount}/${tournament.maxTeamAmount} teams',
+                    '${tournament.currentTeamAmount}/${tournament.maxTeamAmount} Teams',
                     style: const TextStyle(fontSize: 14),
                   ),
                 ],
diff --git a/frontend_splatournament_manager/lib/widgets/profile_widget.dart b/frontend_splatournament_manager/lib/widgets/profile_widget.dart
index 25fc753..abe1617 100644
--- a/frontend_splatournament_manager/lib/widgets/profile_widget.dart
+++ b/frontend_splatournament_manager/lib/widgets/profile_widget.dart
@@ -14,11 +14,11 @@ class _ProfileWidgetState extends State<ProfileWidget> {
   Widget build(BuildContext context) {
     return Consumer<AuthProvider>(
       builder: (context, provider, child) {
-        final username = provider.username ?? "Unknown User";
-        final avatarText = username.length >= 3 
-            ? username.substring(0, 3).toUpperCase() 
+        final username = provider.username ?? 'Unbekannter Benutzer';
+        final avatarText = username.length >= 3
+            ? username.substring(0, 3).toUpperCase()
             : username.toUpperCase();
-        
+
         return Column(
           children: [
             SizedBox(
diff --git a/frontend_splatournament_manager/lib/widgets/teams_list_widget.dart b/frontend_splatournament_manager/lib/widgets/teams_list_widget.dart
index fabeebd..5191f45 100644
--- a/frontend_splatournament_manager/lib/widgets/teams_list_widget.dart
+++ b/frontend_splatournament_manager/lib/widgets/teams_list_widget.dart
@@ -18,21 +18,27 @@ class TeamsListWidget extends StatelessWidget {
             builder: (context, snapshot) {
               final teams = provider.teams;
 
-              if (snapshot.connectionState == ConnectionState.waiting && teams.isEmpty) {
+              if (snapshot.connectionState == ConnectionState.waiting &&
+                  teams.isEmpty) {
                 return const Center(child: CircularProgressIndicator());
               }
 
               if (snapshot.hasError && teams.isEmpty) {
-                return Center(child: Text('Error: ${snapshot.error}'));
+                return Center(
+                  child: Text(
+                    'Fehler: ${snapshot.error.toString().replaceFirst('Exception: ', '')}',
+                  ),
+                );
               }
 
               if (teams.isEmpty) {
-                return const Center(child: Text('No teams found'));
+                return const Center(child: Text('Keine Teams gefunden'));
               }
 
               return ListView.builder(
                 itemCount: teams.length,
-                itemBuilder: (context, index) => TeamListItem(team: teams[index]),
+                itemBuilder: (context, index) =>
+                    TeamListItem(team: teams[index]),
               );
             },
           );
@@ -49,11 +55,13 @@ class TeamListItem extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final memberCountText = team.memberCount != null 
-        ? '${team.memberCount}/4 members'
-        : 'No members';
-    final description = team.description.isEmpty ? 'No description' : team.description;
-    
+    final memberCountText = team.memberCount != null
+        ? '${team.memberCount}/4 Mitglieder'
+        : 'Keine Mitglieder';
+    final description = team.description.isEmpty
+        ? 'Keine Beschreibung'
+        : team.description;
+
     return Card(
       margin: const EdgeInsets.only(bottom: 12),
       child: ListTile(
@@ -66,11 +74,11 @@ class TeamListItem extends StatelessWidget {
         trailing: PopupMenuButton(
           icon: const Icon(Icons.more_vert),
           itemBuilder: (context) => [
-            const PopupMenuItem(value: 'join', child: Text('Join Team')),
-            const PopupMenuItem(value: 'edit', child: Text('Edit Team')),
+            const PopupMenuItem(value: 'join', child: Text('Team beitreten')),
+            const PopupMenuItem(value: 'edit', child: Text('Team bearbeiten')),
             const PopupMenuItem(
               value: 'delete',
-              child: Text('Delete Team', style: TextStyle(color: Colors.red)),
+              child: Text('Team löschen', style: TextStyle(color: Colors.red)),
             ),
           ],
           onSelected: (value) async {
@@ -98,7 +106,7 @@ class TeamListItem extends StatelessWidget {
       await Provider.of<TeamProvider>(context, listen: false).joinTeam(team.id);
       if (context.mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(content: Text('Joined ${team.name}!')),
+          SnackBar(content: Text('Du bist ${team.name} beigetreten.')),
         );
       }
     } catch (e) {
@@ -114,16 +122,18 @@ class TeamListItem extends StatelessWidget {
     final confirmed = await showDialog<bool>(
       context: context,
       builder: (context) => AlertDialog(
-        title: const Text('Delete Team?'),
-        content: Text('Delete "${team.name}"? This cannot be undone.'),
+        title: const Text('Team löschen?'),
+        content: Text(
+          'Soll "${team.name}" gelöscht werden? Das kann nicht rückgängig gemacht werden.',
+        ),
         actions: [
           TextButton(
             onPressed: () => Navigator.pop(context, false),
-            child: const Text('Cancel'),
+            child: const Text('Abbrechen'),
           ),
           TextButton(
             onPressed: () => Navigator.pop(context, true),
-            child: const Text('Delete', style: TextStyle(color: Colors.red)),
+            child: const Text('Löschen', style: TextStyle(color: Colors.red)),
           ),
         ],
       ),
@@ -131,16 +141,23 @@ class TeamListItem extends StatelessWidget {
 
     if (confirmed == true && context.mounted) {
       try {
-        await Provider.of<TeamProvider>(context, listen: false).deleteTeam(team.id);
+        await Provider.of<TeamProvider>(
+          context,
+          listen: false,
+        ).deleteTeam(team.id);
         if (context.mounted) {
-          ScaffoldMessenger.of(context).showSnackBar(
-            const SnackBar(content: Text('Team deleted')),
-          );
+          ScaffoldMessenger.of(
+            context,
+          ).showSnackBar(const SnackBar(content: Text('Team gelöscht')));
         }
       } catch (e) {
         if (context.mounted) {
           ScaffoldMessenger.of(context).showSnackBar(
-            SnackBar(content: Text('Error: $e')),
+            SnackBar(
+              content: Text(
+                'Fehler: ${e.toString().replaceFirst('Exception: ', '')}',
+              ),
+            ),
           );
         }
       }
diff --git a/frontend_splatournament_manager/lib/widgets/theme_selector_widget.dart b/frontend_splatournament_manager/lib/widgets/theme_selector_widget.dart
index 66c9523..64518a4 100644
--- a/frontend_splatournament_manager/lib/widgets/theme_selector_widget.dart
+++ b/frontend_splatournament_manager/lib/widgets/theme_selector_widget.dart
@@ -9,21 +9,21 @@ class ThemeSelectorWidget extends StatelessWidget {
   final List<DropdownMenuItem<AppThemeOption>> dropdownElements = [
     const DropdownMenuItem(
       value: AppThemeOption.lightBlue,
-      child: Text("Light Blue"),
+      child: Text('Helles Blau'),
     ),
     const DropdownMenuItem(
       value: AppThemeOption.darkPurple,
-      child: Text("Dark Purple"),
+      child: Text('Dunkles Lila'),
     ),
     const DropdownMenuItem(
       value: AppThemeOption.lightMint,
-      child: Text("Light Mint"),
+      child: Text('Helles Mint'),
     ),
     const DropdownMenuItem(
       value: AppThemeOption.darkAmber,
-      child: Text("Dark Amber"),
+      child: Text('Dunkles Bernstein'),
     ),
-    const DropdownMenuItem(value: AppThemeOption.system, child: Text("System")),
+    const DropdownMenuItem(value: AppThemeOption.system, child: Text('System')),
   ];
 
   @override
@@ -39,7 +39,7 @@ class ThemeSelectorWidget extends StatelessWidget {
       child: Row(
         mainAxisAlignment: MainAxisAlignment.spaceBetween,
         children: [
-          Text("Theme"),
+          const Text('Design'),
           SizedBox(
             width: 250,
             child: DropdownButtonFormField<AppThemeOption>(
diff --git a/frontend_splatournament_manager/linux/runner/my_application.cc b/frontend_splatournament_manager/linux/runner/my_application.cc
index 4226b8d..16c6151 100644
--- a/frontend_splatournament_manager/linux/runner/my_application.cc
+++ b/frontend_splatournament_manager/linux/runner/my_application.cc
@@ -45,11 +45,11 @@ static void my_application_activate(GApplication* application) {
   if (use_header_bar) {
     GtkHeaderBar* header_bar = GTK_HEADER_BAR(gtk_header_bar_new());
     gtk_widget_show(GTK_WIDGET(header_bar));
-    gtk_header_bar_set_title(header_bar, "frontend_splatournament_manager");
+    gtk_header_bar_set_title(header_bar, "Splatournament Manager");
     gtk_header_bar_set_show_close_button(header_bar, TRUE);
     gtk_window_set_titlebar(window, GTK_WIDGET(header_bar));
   } else {
-    gtk_window_set_title(window, "frontend_splatournament_manager");
+    gtk_window_set_title(window, "Splatournament Manager");
   }
 
   gtk_window_set_default_size(window, 1280, 720);
diff --git a/frontend_splatournament_manager/pubspec.yaml b/frontend_splatournament_manager/pubspec.yaml
index be81728..4e5e9f3 100644
--- a/frontend_splatournament_manager/pubspec.yaml
+++ b/frontend_splatournament_manager/pubspec.yaml
@@ -41,6 +41,8 @@ dependencies:
   flutter_secure_storage: ^10.0.0
   jwt_decoder: ^2.0.1
   shared_preferences: ^2.3.3
+  flutter_localizations:
+    sdk: flutter
 
 dev_dependencies:
   flutter_test:
diff --git a/frontend_splatournament_manager/web/index.html b/frontend_splatournament_manager/web/index.html
index e26a7ad..cdce377 100644
--- a/frontend_splatournament_manager/web/index.html
+++ b/frontend_splatournament_manager/web/index.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="de">
 <head>
   <!--
     If you are serving your web app in a path other than the root, change the
@@ -18,18 +18,18 @@
 
   <meta charset="UTF-8">
   <meta content="IE=Edge" http-equiv="X-UA-Compatible">
-  <meta name="description" content="A tournament Manager for Splatoon">
+  <meta name="description" content="Ein Turnier-Manager für Splatoon">
 
   <!-- iOS meta tags & icons -->
   <meta name="mobile-web-app-capable" content="yes">
   <meta name="apple-mobile-web-app-status-bar-style" content="black">
-  <meta name="apple-mobile-web-app-title" content="frontend_splatournament_manager">
+  <meta name="apple-mobile-web-app-title" content="Splatournament Manager">
   <link rel="apple-touch-icon" href="icons/Icon-192.png">
 
   <!-- Favicon -->
   <link rel="icon" type="image/png" href="favicon.png"/>
 
-  <title>frontend_splatournament_manager</title>
+  <title>Splatournament Manager</title>
   <link rel="manifest" href="manifest.json">
 </head>
 <body>
diff --git a/frontend_splatournament_manager/web/manifest.json b/frontend_splatournament_manager/web/manifest.json
index 0444e0b..28f0773 100644
--- a/frontend_splatournament_manager/web/manifest.json
+++ b/frontend_splatournament_manager/web/manifest.json
@@ -1,11 +1,11 @@
 {
-    "name": "frontend_splatournament_manager",
-    "short_name": "frontend_splatournament_manager",
+    "name": "Splatournament Manager",
+    "short_name": "Splatournament",
     "start_url": ".",
     "display": "standalone",
     "background_color": "#0175C2",
     "theme_color": "#0175C2",
-    "description": "A tournament Manager for Splatoon",
+    "description": "Ein Turnier-Manager für Splatoon",
     "orientation": "portrait-primary",
     "prefer_related_applications": false,
     "icons": [
diff --git a/frontend_splatournament_manager/windows/runner/Runner.rc b/frontend_splatournament_manager/windows/runner/Runner.rc
index 42f3e9e..0ffe848 100644
--- a/frontend_splatournament_manager/windows/runner/Runner.rc
+++ b/frontend_splatournament_manager/windows/runner/Runner.rc
@@ -90,12 +90,12 @@ BEGIN
         BLOCK "040904e4"
         BEGIN
             VALUE "CompanyName", "com.tikaiz" "\0"
-            VALUE "FileDescription", "frontend_splatournament_manager" "\0"
+            VALUE "FileDescription", "Splatournament Manager" "\0"
             VALUE "FileVersion", VERSION_AS_STRING "\0"
             VALUE "InternalName", "frontend_splatournament_manager" "\0"
             VALUE "LegalCopyright", "Copyright (C) 2026 com.tikaiz. All rights reserved." "\0"
             VALUE "OriginalFilename", "frontend_splatournament_manager.exe" "\0"
-            VALUE "ProductName", "frontend_splatournament_manager" "\0"
+            VALUE "ProductName", "Splatournament Manager" "\0"
             VALUE "ProductVersion", VERSION_AS_STRING "\0"
         END
     END
diff --git a/frontend_splatournament_manager/windows/runner/main.cpp b/frontend_splatournament_manager/windows/runner/main.cpp
index 78b5f6d..1ab2564 100644
--- a/frontend_splatournament_manager/windows/runner/main.cpp
+++ b/frontend_splatournament_manager/windows/runner/main.cpp
@@ -27,7 +27,7 @@ int APIENTRY wWinMain(_In_ HINSTANCE instance, _In_opt_ HINSTANCE prev,
   FlutterWindow window(project);
   Win32Window::Point origin(10, 10);
   Win32Window::Size size(1280, 720);
-  if (!window.Create(L"frontend_splatournament_manager", origin, size)) {
+  if (!window.Create(L"Splatournament Manager", origin, size)) {
     return EXIT_FAILURE;
   }
   window.SetQuitOnClose(true);