Feature: Add support for localization, introduce slang for translations, and integrate German and English locale support throughout the app

finlog_app/app/lib/main.dart

@@ -1,9 +1,11 @@
 import 'package:app/core/app/router.dart';
 import 'package:app/core/app/startup/domain/initialize_app.dart';
+import 'package:app/core/i18n/translations.g.dart';
 import 'package:app/core/ui/controller/locale_controller.dart';
 import 'package:app/core/ui/controller/scale_controller.dart';
 import 'package:app/core/ui/controller/theme.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:fluttery/fluttery.dart';
 import 'package:fluttery/logger.dart';
 import 'package:go_router/go_router.dart';
@@ -37,7 +39,9 @@ Future<void> main() async {
         ChangeNotifierProvider(create: (context) => scaleController),
         ChangeNotifierProvider(create: (context) => localeController),
       ],
-      child: FinlogApp(router: buildAppRouter(startRoute)),
+      child: TranslationProvider(
+        child: FinlogApp(router: buildAppRouter(startRoute)),
+      ),
     ),
   );
 }
@@ -51,14 +55,14 @@ class FinlogApp extends StatelessWidget {
   Widget build(BuildContext context) {
     final theme = context.watch<ThemeController>();
     final textScale = context.watch<ScaleController>();
-    final localeCtrl = context.watch<LocaleController>();
 
     return AnimatedBuilder(
       animation: theme,
       builder: (context, _) => MaterialApp.router(
         title: 'Finlog',
-        locale: localeCtrl.locale,
-        supportedLocales: const [Locale('de'), Locale('en')],
+        locale: TranslationProvider.of(context).flutterLocale,
+        supportedLocales: AppLocaleUtils.supportedLocales,
+        localizationsDelegates: GlobalMaterialLocalizations.delegates,
         theme: ThemeData.light(),
         darkTheme: ThemeData.dark(),
         themeMode: theme.themeMode,