feat: localisation with en, de, fr and it

lib/core/error/enhanced_error_service.dart

@@ -6,6 +6,7 @@ import 'api_error_handler.dart';
 import 'api_error_interceptor.dart';
 import '../../shared/theme/app_theme.dart';
 import '../../shared/theme/theme_extensions.dart';
+import 'package:conduit/l10n/app_localizations.dart';
 
 /// Enhanced error service with comprehensive error handling capabilities
 /// Provides unified error management across the application
@@ -136,8 +137,8 @@ class EnhancedErrorService {
       action: isRetryableError && onRetry != null
           ? SnackBarAction(
               label: retryDelay != null && retryDelay.inSeconds > 5
-                  ? 'Retry (${retryDelay.inSeconds}s)'
-                  : 'Retry',
+                  ? "${AppLocalizations.of(context)!.retry} (${retryDelay.inSeconds}s)"
+                  : AppLocalizations.of(context)!.retry,
               textColor: AppTheme.neutral50,
               onPressed: onRetry,
             )
@@ -208,14 +209,14 @@ class EnhancedErrorService {
                   Navigator.of(context).pop();
                   onRetry();
                 },
-                child: const Text('Retry'),
+                child: Text(AppLocalizations.of(context)!.retry),
               ),
             TextButton(
               onPressed: () {
                 Navigator.of(context).pop();
                 onDismiss?.call();
               },
-              child: const Text('OK'),
+              child: Text(AppLocalizations.of(context)!.ok),
             ),
           ],
         );
@@ -281,7 +282,7 @@ class EnhancedErrorService {
             ElevatedButton.icon(
               onPressed: onRetry,
               icon: const Icon(Icons.refresh),
-              label: const Text('Try Again'),
+              label: const Text('Retry'),
             ),
           ],
         ],

lib/core/providers/app_providers.dart

@@ -79,6 +79,36 @@ class ThemeModeNotifier extends StateNotifier<ThemeMode> {
   }
 }
 
+// Locale provider
+final localeProvider = StateNotifierProvider<LocaleNotifier, Locale?>(
+  (ref) {
+    final storage = ref.watch(optimizedStorageServiceProvider);
+    return LocaleNotifier(storage);
+  },
+);
+
+class LocaleNotifier extends StateNotifier<Locale?> {
+  final OptimizedStorageService _storage;
+
+  LocaleNotifier(this._storage) : super(null) {
+    _loadLocale();
+  }
+
+  void _loadLocale() {
+    final code = _storage.getLocaleCode();
+    if (code != null && code.isNotEmpty) {
+      state = Locale(code);
+    } else {
+      state = null; // system
+    }
+  }
+
+  Future<void> setLocale(Locale? locale) async {
+    state = locale;
+    await _storage.setLocaleCode(locale?.languageCode);
+  }
+}
+
 // Server connection providers - optimized with caching
 final serverConfigsProvider = FutureProvider<List<ServerConfig>>((ref) async {
   final storage = ref.watch(optimizedStorageServiceProvider);

lib/core/services/optimized_storage_service.dart

@@ -23,6 +23,7 @@ class OptimizedStorageService {
   static const String _activeServerIdKey = 'active_server_id';
   static const String _rememberCredentialsKey = 'remember_credentials';
   static const String _themeModeKey = 'theme_mode';
+  static const String _localeCodeKey = 'locale_code_v1';
   static const String _localConversationsKey = 'local_conversations';
   static const String _onboardingSeenKey = 'onboarding_seen_v1';
   static const String _reviewerModeKey = 'reviewer_mode_v1';
@@ -226,6 +227,20 @@ class OptimizedStorageService {
     await _prefs.setString(_themeModeKey, mode);
   }
 
+  /// Locale Management
+  String? getLocaleCode() {
+    // Returns a locale code like 'en', 'de', 'fr', 'it'. Null means system.
+    return _prefs.getString(_localeCodeKey);
+  }
+
+  Future<void> setLocaleCode(String? code) async {
+    if (code == null || code.isEmpty) {
+      await _prefs.remove(_localeCodeKey);
+    } else {
+      await _prefs.setString(_localeCodeKey, code);
+    }
+  }
+
   /// Onboarding
   Future<bool> getOnboardingSeen() async {
     return _prefs.getBool(_onboardingSeenKey) ?? false;

lib/core/services/user_friendly_error_handler.dart

@@ -182,12 +182,12 @@ class UserFriendlyErrorHandler {
   List<ErrorRecoveryAction> _getServerRecoveryActions() {
     return [
       ErrorRecoveryAction(
-        label: 'Try Again',
+        label: 'Retry',
         action: ErrorActionType.retry,
         description: 'Retry your request',
       ),
       ErrorRecoveryAction(
-        label: 'Wait & Retry',
+        label: 'Retry',
         action: ErrorActionType.retryLater,
         description: 'Wait a moment then try again',
       ),
@@ -223,7 +223,7 @@ class UserFriendlyErrorHandler {
         description: 'Sign in to your account',
       ),
       ErrorRecoveryAction(
-        label: 'Try Again',
+        label: 'Retry',
         action: ErrorActionType.retry,
         description: 'Retry the request',
       ),
@@ -280,7 +280,7 @@ class UserFriendlyErrorHandler {
         description: 'Select another file',
       ),
       ErrorRecoveryAction(
-        label: 'Try Again',
+        label: 'Retry',
         action: ErrorActionType.retry,
         description: 'Retry the operation',
       ),
@@ -314,7 +314,7 @@ class UserFriendlyErrorHandler {
         description: 'Open app settings to grant permissions',
       ),
       ErrorRecoveryAction(
-        label: 'Try Again',
+        label: 'Retry',
         action: ErrorActionType.retry,
         description: 'Retry after granting permission',
       ),
@@ -324,7 +324,7 @@ class UserFriendlyErrorHandler {
   List<ErrorRecoveryAction> _getGenericRecoveryActions() {
     return [
       ErrorRecoveryAction(
-        label: 'Try Again',
+        label: 'Retry',
         action: ErrorActionType.retry,
         description: 'Retry the operation',
       ),

lib/core/widgets/error_boundary.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../../shared/theme/theme_extensions.dart';
 import '../error/enhanced_error_service.dart';
+import 'package:conduit/l10n/app_localizations.dart';
 
 /// Error boundary widget that catches and handles errors in child widgets
 class ErrorBoundary extends ConsumerStatefulWidget {
@@ -122,7 +123,7 @@ class _ErrorBoundaryState extends ConsumerState<ErrorBoundary> {
                 ),
                 const SizedBox(height: 16),
                 Text(
-                  'Something went wrong',
+                  AppLocalizations.of(context)!.errorMessage,
                   style: Theme.of(context).textTheme.headlineSmall?.copyWith(
                     color: context.conduitTheme.textPrimary,
                   ),
@@ -140,7 +141,7 @@ class _ErrorBoundaryState extends ConsumerState<ErrorBoundary> {
                   FilledButton.icon(
                     onPressed: _retry,
                     icon: const Icon(Icons.refresh),
-                    label: const Text('Try Again'),
+                    label: Text(AppLocalizations.of(context)!.retry),
                   ),
                 ],
               ],
@@ -239,7 +240,7 @@ class AsyncErrorBoundary extends ConsumerWidget {
                         (context as Element).markNeedsBuild();
                       },
                       icon: const Icon(Icons.refresh),
-                      label: const Text('Retry'),
+                      label: Text(AppLocalizations.of(context)!.retry),
                     ),
                   ],
                 ],