Migrate localizations and enable untranslated logs

Flutter deprecated flutter_gen style localization,
Following the official documentation, synthetic packages are now disable in l10n and output dir is set to lib/l10n/
https://docs.flutter.dev/ui/accessibility-and-internationalization/internationalization#adding-your-own-localized-messages
https://docs.flutter.dev/release/breaking-changes/flutter-generate-i10n-source

Author: Renarde-dev

l10n.yaml

@@ -1,3 +1,6 @@
+synthetic-package: false
 arb-dir: l10n
 template-arb-file: app_en.arb
+untranslated-messages-file: l10n/untranslated.json
+output-dir: lib/l10n
 output-localization-file: app_localizations.dart

lib/app.dart

@@ -1,6 +1,5 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_easyloading/flutter_easyloading.dart';
-import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:image_picker/image_picker.dart';
 import 'package:piwigo_ng/services/app_providers.dart';
@@ -26,6 +25,7 @@ import 'package:piwigo_ng/views/unknown_route_page.dart';
 import 'package:piwigo_ng/views/upload/upload_page.dart';
 import 'package:piwigo_ng/views/upload/upload_status_page.dart';
 
+import '/l10n/app_localizations.dart';
 import 'models/image_model.dart';
 
 class App extends StatelessWidget {

lib/services/notification_service.dart

@@ -1,14 +1,14 @@
 import 'dart:io';
 
 import 'package:flutter/material.dart';
-import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 import 'package:flutter_local_notifications/flutter_local_notifications.dart';
 import 'package:open_filex/open_filex.dart';
 import 'package:piwigo_ng/services/locale_provider.dart';
 import 'package:piwigo_ng/services/preferences_service.dart';
 import 'package:piwigo_ng/utils/localizations.dart';
 import 'package:piwigo_ng/utils/settings.dart';
 import 'package:shared_preferences/shared_preferences.dart';
+import '/l10n/app_localizations.dart';
 
 final FlutterLocalNotificationsPlugin localNotification = FlutterLocalNotificationsPlugin();
 

lib/utils/localizations.dart

@@ -1,5 +1,5 @@
-import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 import 'package:piwigo_ng/app.dart';
+import '/l10n/app_localizations.dart';
 
 AppLocalizations get appStrings =>
     AppLocalizations.of(App.scaffoldMessengerKey.currentContext!)!;

lib/views/settings/select_language_page.dart

@@ -1,8 +1,8 @@
 import 'package:flutter/material.dart';
-import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 import 'package:piwigo_ng/services/locale_provider.dart';
 import 'package:piwigo_ng/utils/localizations.dart';
 import 'package:provider/provider.dart';
+import '/l10n/app_localizations.dart';
 
 class SelectLanguagePage extends StatefulWidget {
   const SelectLanguagePage({Key? key}) : super(key: key);