904: Use built in flutter localization

frontend/l10n.yaml

@@ -0,0 +1,3 @@
+arb-dir: lib/l10n
+template-arb-file: app_en.arb
+output-localization-file: app_localizations.dart

frontend/lib/about/about_page.dart

@@ -7,14 +7,14 @@ import 'package:ehrenamtskarte/build_config/build_config.dart' show buildConfig;
 import 'package:ehrenamtskarte/configuration/configuration.dart';
 import 'package:ehrenamtskarte/routing.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter_i18n/flutter_i18n.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 import 'package:url_launcher/url_launcher_string.dart';
 
 import '../util/i18n.dart';
 
 class AboutPage extends StatefulWidget {
   final countToEnableSwitch = 10;
+
   const AboutPage({super.key});
 
   @override
@@ -70,29 +70,28 @@ class AboutPageState extends State<AboutPage> {
                 child: Column(
                   children: [
                     Center(
-                      child: I18nText('publisher', child: Text('', style: Theme.of(context).textTheme.titleSmall)),
+                      child: Text(t(context).about_publisher, style: Theme.of(context).textTheme.titleSmall),
                     ),
                     Padding(
                       padding: const EdgeInsets.only(left: 10, right: 10, top: 16, bottom: 16),
                       child: Text(buildConfig.publisherAddress, style: Theme.of(context).textTheme.bodyLarge),
                     ),
-                    I18nText(
-                      'moreInformation',
-                      child: Text('',
+                    Text(
+                      t(context).about_moreInformation,
                       style: Theme.of(context)
                           .textTheme
                           .bodyMedium
                           ?.merge(TextStyle(color: Theme.of(context).colorScheme.secondary)),
                     ),
-                    ),
                   ],
                 ),
               ),
               onTap: () {
                 Navigator.push(
                   context,
                   AppRoute(
-                    builder: (context) => ContentPage(title: t(context, 'publisher'), children: getPublisherText(context)),
+                    builder: (context) =>
+                        ContentPage(title: t(context).about_publisher, children: getPublisherText(context)),
                   ),
                 );
               },
@@ -102,20 +101,20 @@ class AboutPageState extends State<AboutPage> {
               thickness: 1,
             ),
             const SizedBox(height: 20),
-            ContentTile(icon: Icons.copyright, title: t(context, 'license'), children: getCopyrightText(context)),
+            ContentTile(icon: Icons.copyright, title: t(context).about_license, children: getCopyrightText(context)),
             ListTile(
               leading: const Icon(Icons.privacy_tip_outlined),
-              title: I18nText('privacyDeclaration'),
+              title: Text(t(context).about_privacyDeclaration),
               onTap: () => launchUrlString(buildConfig.dataPrivacyPolicyUrl, mode: LaunchMode.externalApplication),
             ),
             ContentTile(
               icon: Icons.info_outline,
-              title: t(context, 'disclaimer'),
+              title: t(context).about_disclaimer,
               children: getDisclaimerText(context),
             ),
             ListTile(
               leading: const Icon(Icons.book_outlined),
-              title: I18nText('dependencies'),
+              title: Text(t(context).about_dependencies),
               onTap: () {
                 Navigator.push(
                   context,
@@ -127,7 +126,7 @@ class AboutPageState extends State<AboutPage> {
             ),
             ListTile(
               leading: const Icon(Icons.code_outlined),
-              title: I18nText('sourceCode'),
+              title: Text(t(context).about_sourceCode),
               onTap: () {
                 launchUrlString(
                   'https://github.com/digitalfabrik/entitlementcard',
@@ -138,11 +137,11 @@ class AboutPageState extends State<AboutPage> {
             if (config.showDevSettings)
               ListTile(
                 leading: const Icon(Icons.build),
-                title: I18nText('developmentOptions'),
+                title: Text(t(context).about_developmentOptions),
                 onTap: () => showDialog(
                   context: context,
                   builder: (context) =>
-                      SimpleDialog(title: I18nText('developmentOptions'), children: [DevSettingsView()]),
+                      SimpleDialog(title: Text(t(context).about_developmentOptions), children: [DevSettingsView()]),
                 ),
               )
           ];

frontend/lib/about/license_page.dart

@@ -5,7 +5,6 @@ import 'package:ehrenamtskarte/widgets/error_message.dart';
 import 'package:ehrenamtskarte/widgets/top_loading_spinner.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter_i18n/flutter_i18n.dart';
 
 import '../util/i18n.dart';
 
@@ -54,15 +53,15 @@ class CustomLicensePage extends StatelessWidget {
 
           return CustomScrollView(
             slivers: <Widget>[
-              CustomSliverAppBar(title: t(context, 'licenses')),
+              CustomSliverAppBar(title: t(context).about_licenses),
               SliverList(
                 delegate: SliverChildBuilderDelegate(
                   (BuildContext context, int index) {
                     final license = result[index];
                     final paragraphs = license.licenseParagraphs;
                     return ListTile(
                       title: Text(license.packageName),
-                      subtitle: I18nPlural('numberLicenses', paragraphs.length),
+                      subtitle: Text(t(context).about_numberLicenses(paragraphs.length)),
                       onTap: () {
                         Navigator.push(
                           context,

frontend/lib/app.dart

@@ -8,9 +8,9 @@ import 'package:ehrenamtskarte/intro_slides/intro_screen.dart';
 import 'package:ehrenamtskarte/themes.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter_i18n/flutter_i18n.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:provider/provider.dart';
+import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 
 import 'home/home_page.dart';
 
@@ -68,11 +68,7 @@ class App extends StatelessWidget {
             themeMode: ThemeMode.system,
             debugShowCheckedModeBanner: false,
             localizationsDelegates: [
-              FlutterI18nDelegate(
-                translationLoader: FileTranslationLoader(useCountryCode: false, fallbackFile: 'de', basePath: 'assets/bayern/translations'),
-                missingTranslationHandler: (key, locale) =>
-                    print('--- Missing Key: $key, languageCode: ${locale?.languageCode}'),
-              ),
+              AppLocalizations.delegate,
               GlobalMaterialLocalizations.delegate,
               GlobalWidgetsLocalizations.delegate,
               GlobalCupertinoLocalizations.delegate,

frontend/lib/home/home_page.dart

@@ -39,23 +39,24 @@ class HomePageState extends State<HomePage> {
           selectAcceptingStore: (id) => setState(() => selectedAcceptingStoreId = id),
         ),
         Icons.map_outlined,
-        t(context, 'card'),
+        t(context).map_title,
         GlobalKey<NavigatorState>(debugLabel: 'Map tab key'),
       ),
       AppFlow(
         const SearchPage(),
         Icons.search_outlined,
-        t(context, 'search'),
+        t(context).search_title,
         GlobalKey<NavigatorState>(debugLabel: 'Search tab key'),
       ),
       if (buildConfig.featureFlags.verification)
         AppFlow(
           IdentificationPage(),
           Icons.remove_red_eye_outlined,
-          t(context, 'authentication'),
+          t(context).identification_title,
           GlobalKey<NavigatorState>(debugLabel: 'Auth tab key'),
         ),
-      AppFlow(const AboutPage(), Icons.info_outline, t(context, 'about'), GlobalKey<NavigatorState>(debugLabel: 'About tab key')),
+      AppFlow(const AboutPage(), Icons.info_outline, t(context).about_title,
+          GlobalKey<NavigatorState>(debugLabel: 'About tab key')),
     ];
   }
 

frontend/lib/identification/activation_workflow/activation_code_scanner_page.dart

@@ -53,25 +53,19 @@ class ActivationCodeScannerPage extends StatelessWidget {
 
       await _activateCode(context, activationCode);
     } on ActivationDidNotOverwriteExisting catch (_) {
-      await showError(t(context, 'cardAlreadyActivated'), null);
+      await showError(t(context).identification_cardAlreadyActivated, null);
     } on QrCodeFieldMissingException catch (e) {
-      await showError(t(context, 'codeInvalidMissing', translationParams: { 'missing': e.missingFieldName }));
+      await showError(t(context).identification_codeInvalidMissing(e.missingFieldName), null);
     } on QrCodeWrongTypeException catch (_) {
-      await showError(t(context, 'codeSavingFailed'));
+      await showError(t(context).identification_codeSavingFailed, null);
     } on CardExpiredException catch (e) {
       final expirationDate = DateFormat('dd.MM.yyyy').format(e.expiry);
-      await showError(t(context, 'codeExpired', translationParams: { 'expirationDate': expirationDate }));
-    } on ServerCardActivationException catch (e, stackTrace) {
-      String errorMessage = 'Der eingescannte Code konnte nicht aktiviert '
-          'werden, da die Kommunikation mit dem Server fehlschlug. '
-          'Bitte prüfen Sie Ihre Internetverbindung.';
-      await ConnectionFailedDialog.show(
-        context,
-        t(context, 'codeVerificationFailedConnection')
-      );
+      await showError(t(context).identification_codeExpired(expirationDate), null);
+    } on ServerCardActivationException catch (_) {
+      await ConnectionFailedDialog.show(context, t(context).identification_codeVerificationFailedConnection);
     } on Exception catch (e, stacktrace) {
       debugPrintStack(stackTrace: stacktrace, label: e.toString());
-      await showError(t(context, 'codeUnknownError'));
+      await showError(t(context).identification_codeUnknownError, null);
     }
   }
 
@@ -116,7 +110,7 @@ class ActivationCodeScannerPage extends StatelessWidget {
       case ActivationState.failed:
         await QrParsingErrorDialog.showErrorDialog(
           context,
-          t(context, 'codeInvalid'),
+          t(context).identification_codeInvalid,
         );
         break;
       case ActivationState.didNotOverwriteExisting:
@@ -130,7 +124,7 @@ class ActivationCodeScannerPage extends StatelessWidget {
         }
         break;
       default:
-        throw ServerCardActivationException(t(context, 'activationInvalidState'));
+        throw ServerCardActivationException(t(context).identification_activationInvalidState);
     }
   }
 }

frontend/lib/identification/activation_workflow/activation_overwrite_existing_dialog.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:flutter_i18n/flutter_i18n.dart';
 
 import '../../util/i18n.dart';
 
@@ -9,23 +8,23 @@ class ActivationOverwriteExistingDialog extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return AlertDialog(
-      title: Text(t(context, 'activateCardCurrentDevice'), style: TextStyle(fontSize: 18)),
+      title: Text(t(context).identification_activateCardCurrentDevice, style: TextStyle(fontSize: 18)),
       content: SingleChildScrollView(
         child: ListBody(
           children: <Widget>[
-            I18nText('activateCardCurrentDeviceRationale'),
+            Text(t(context).identification_activateCardCurrentDeviceRationale),
           ],
         ),
       ),
       actions: <Widget>[
         TextButton(
-          child: I18nText('cancel'),
+          child: Text(t(context).common_cancel),
           onPressed: () {
             Navigator.of(context).pop(false);
           },
         ),
         TextButton(
-          child: I18nText('activate'),
+          child: Text(t(context).identification_activate),
           onPressed: () {
             Navigator.of(context).pop(true);
           },