[fix] Added basic locatlization

lib/l10n/app_de.arb

@@ -0,0 +1,16 @@
+{
+    "@@locale": "de", 
+    "addToCollection": "Speichern in {collection_name}",
+    "@addToCollection": {
+        "placeholders": {
+            "collection_name" : {
+                "type": "String"
+            }
+        }
+    },
+    "cancel": "Abbrechen",
+    "chooseCollection": "Sammlung auswählen",
+    "collections": "Sammlungen",
+    "tipCreateCollections": "Erstelle deine erste Sammlung!",
+    "search": "Suche"
+}

lib/l10n/app_en.arb

@@ -0,0 +1,16 @@
+{
+    "@@locale": "en", 
+    "addToCollection": "Add to {collection_name}",
+    "@addToCollection": {
+        "placeholders": {
+            "collection_name" : {
+                "type": "String"
+            }
+        }
+    },
+    "cancel": "Cancel",
+    "chooseCollection": "Choose Collection",
+    "collections": "Collections",
+    "tipCreateCollections": "Create your first Collection to get started!",
+    "search": "Search"
+}

lib/l10n/app_localizations.dart

@@ -0,0 +1,170 @@
+import 'dart:async';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+import 'package:intl/intl.dart' as intl;
+
+import 'app_localizations_de.dart';
+import 'app_localizations_en.dart';
+
+// ignore_for_file: type=lint
+
+/// Callers can lookup localized strings with an instance of AppLocalizations
+/// returned by `AppLocalizations.of(context)`.
+///
+/// Applications need to include `AppLocalizations.delegate()` in their app's
+/// `localizationDelegates` list, and the locales they support in the app's
+/// `supportedLocales` list. For example:
+///
+/// ```dart
+/// import 'l10n/app_localizations.dart';
+///
+/// return MaterialApp(
+///   localizationsDelegates: AppLocalizations.localizationsDelegates,
+///   supportedLocales: AppLocalizations.supportedLocales,
+///   home: MyApplicationHome(),
+/// );
+/// ```
+///
+/// ## Update pubspec.yaml
+///
+/// Please make sure to update your pubspec.yaml to include the following
+/// packages:
+///
+/// ```yaml
+/// dependencies:
+///   # Internationalization support.
+///   flutter_localizations:
+///     sdk: flutter
+///   intl: any # Use the pinned version from flutter_localizations
+///
+///   # Rest of dependencies
+/// ```
+///
+/// ## iOS Applications
+///
+/// iOS applications define key application metadata, including supported
+/// locales, in an Info.plist file that is built into the application bundle.
+/// To configure the locales supported by your app, you’ll need to edit this
+/// file.
+///
+/// First, open your project’s ios/Runner.xcworkspace Xcode workspace file.
+/// Then, in the Project Navigator, open the Info.plist file under the Runner
+/// project’s Runner folder.
+///
+/// Next, select the Information Property List item, select Add Item from the
+/// Editor menu, then select Localizations from the pop-up menu.
+///
+/// Select and expand the newly-created Localizations item then, for each
+/// locale your application supports, add a new item and select the locale
+/// you wish to add from the pop-up menu in the Value field. This list should
+/// be consistent with the languages listed in the AppLocalizations.supportedLocales
+/// property.
+abstract class AppLocalizations {
+  AppLocalizations(String locale)
+    : localeName = intl.Intl.canonicalizedLocale(locale.toString());
+
+  final String localeName;
+
+  static AppLocalizations? of(BuildContext context) {
+    return Localizations.of<AppLocalizations>(context, AppLocalizations);
+  }
+
+  static const LocalizationsDelegate<AppLocalizations> delegate =
+      _AppLocalizationsDelegate();
+
+  /// A list of this localizations delegate along with the default localizations
+  /// delegates.
+  ///
+  /// Returns a list of localizations delegates containing this delegate along with
+  /// GlobalMaterialLocalizations.delegate, GlobalCupertinoLocalizations.delegate,
+  /// and GlobalWidgetsLocalizations.delegate.
+  ///
+  /// Additional delegates can be added by appending to this list in
+  /// MaterialApp. This list does not have to be used at all if a custom list
+  /// of delegates is preferred or required.
+  static const List<LocalizationsDelegate<dynamic>> localizationsDelegates =
+      <LocalizationsDelegate<dynamic>>[
+        delegate,
+        GlobalMaterialLocalizations.delegate,
+        GlobalCupertinoLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+      ];
+
+  /// A list of this localizations delegate's supported locales.
+  static const List<Locale> supportedLocales = <Locale>[
+    Locale('de'),
+    Locale('en'),
+  ];
+
+  /// No description provided for @addToCollection.
+  ///
+  /// In en, this message translates to:
+  /// **'Add to {collection_name}'**
+  String addToCollection(String collection_name);
+
+  /// No description provided for @cancel.
+  ///
+  /// In en, this message translates to:
+  /// **'Cancel'**
+  String get cancel;
+
+  /// No description provided for @chooseCollection.
+  ///
+  /// In en, this message translates to:
+  /// **'Choose Collection'**
+  String get chooseCollection;
+
+  /// No description provided for @collections.
+  ///
+  /// In en, this message translates to:
+  /// **'Collections'**
+  String get collections;
+
+  /// No description provided for @tipCreateCollections.
+  ///
+  /// In en, this message translates to:
+  /// **'Create your first Collection to get started!'**
+  String get tipCreateCollections;
+
+  /// No description provided for @search.
+  ///
+  /// In en, this message translates to:
+  /// **'Search'**
+  String get search;
+}
+
+class _AppLocalizationsDelegate
+    extends LocalizationsDelegate<AppLocalizations> {
+  const _AppLocalizationsDelegate();
+
+  @override
+  Future<AppLocalizations> load(Locale locale) {
+    return SynchronousFuture<AppLocalizations>(lookupAppLocalizations(locale));
+  }
+
+  @override
+  bool isSupported(Locale locale) =>
+      <String>['de', 'en'].contains(locale.languageCode);
+
+  @override
+  bool shouldReload(_AppLocalizationsDelegate old) => false;
+}
+
+AppLocalizations lookupAppLocalizations(Locale locale) {
+  // Lookup logic when only language code is specified.
+  switch (locale.languageCode) {
+    case 'de':
+      return AppLocalizationsDe();
+    case 'en':
+      return AppLocalizationsEn();
+  }
+
+  throw FlutterError(
+    'AppLocalizations.delegate failed to load unsupported locale "$locale". This is likely '
+    'an issue with the localizations generation tool. Please file an issue '
+    'on GitHub with a reproducible sample app and the gen-l10n configuration '
+    'that was used.',
+  );
+}

lib/l10n/app_localizations_de.dart

@@ -0,0 +1,30 @@
+// ignore: unused_import
+import 'package:intl/intl.dart' as intl;
+import 'app_localizations.dart';
+
+// ignore_for_file: type=lint
+
+/// The translations for German (`de`).
+class AppLocalizationsDe extends AppLocalizations {
+  AppLocalizationsDe([String locale = 'de']) : super(locale);
+
+  @override
+  String addToCollection(String collection_name) {
+    return 'Speichern in $collection_name';
+  }
+
+  @override
+  String get cancel => 'Abbrechen';
+
+  @override
+  String get chooseCollection => 'Sammlung auswählen';
+
+  @override
+  String get collections => 'Sammlungen';
+
+  @override
+  String get tipCreateCollections => 'Erstelle deine erste Sammlung!';
+
+  @override
+  String get search => 'Suche';
+}

lib/l10n/app_localizations_en.dart

@@ -0,0 +1,31 @@
+// ignore: unused_import
+import 'package:intl/intl.dart' as intl;
+import 'app_localizations.dart';
+
+// ignore_for_file: type=lint
+
+/// The translations for English (`en`).
+class AppLocalizationsEn extends AppLocalizations {
+  AppLocalizationsEn([String locale = 'en']) : super(locale);
+
+  @override
+  String addToCollection(String collection_name) {
+    return 'Add to $collection_name';
+  }
+
+  @override
+  String get cancel => 'Cancel';
+
+  @override
+  String get chooseCollection => 'Choose Collection';
+
+  @override
+  String get collections => 'Collections';
+
+  @override
+  String get tipCreateCollections =>
+      'Create your first Collection to get started!';
+
+  @override
+  String get search => 'Search';
+}

lib/main.dart

@@ -1,5 +1,7 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:provider/provider.dart';
+import 'l10n/app_localizations.dart';
 import 'pages/collection_page.dart';
 import 'pages/collections_list_page.dart';
 import 'pages/search_page.dart';
@@ -66,6 +68,13 @@ class _MapsBookmarksState extends State<MapsBookmarks>
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
+      localizationsDelegates: [
+        AppLocalizations.delegate,
+        GlobalMaterialLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+        GlobalCupertinoLocalizations.delegate,
+      ],
+      supportedLocales: [Locale('en'), Locale('de')],
       navigatorKey: _navigatorKey,
       theme: lightTheme,
       darkTheme: darkTheme,

lib/pages/collection_page.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
+import '../l10n/app_localizations.dart';
 import '../model/bookmark.dart';
 import '../model/maps_link_metadata.dart';
 import '../service/bookmarks_provider.dart';
@@ -89,13 +90,15 @@ class _CollectionPageState extends State<CollectionPage> {
     return Scaffold(
       appBar: AppBar(
         title: selectedMapsLink != null
-            ? Text('Add to ${collection.name}')
+            ? Text(
+                AppLocalizations.of(context)!.addToCollection(collection.name),
+              )
             : Text(collection.name),
         actions: [
           if (selectedMapsLink != null)
             TextButton(
               onPressed: () => provider.removeCurrentMapsLink(),
-              child: Text('Cancel'),
+              child: Text(AppLocalizations.of(context)!.cancel),
             ),
         ],
       ),

lib/pages/collections_list_page.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
+import '../l10n/app_localizations.dart';
 import '../model/collection.dart';
 import '../service/bookmarks_provider.dart';
 import '../service/shared_link_provider.dart';
@@ -88,13 +89,13 @@ class _CollectionsListPageState extends State<CollectionsListPage> {
     return Scaffold(
       appBar: AppBar(
         title: addingNewBookmark
-            ? Text('Choose Collection')
-            : Text('Collections'),
+            ? Text(AppLocalizations.of(context)!.chooseCollection)
+            : Text(AppLocalizations.of(context)!.collections),
         actions: [
           if (addingNewBookmark)
             TextButton(
               onPressed: () => provider.removeCurrentMapsLink(),
-              child: Text('Cancel'),
+              child: Text(AppLocalizations.of(context)!.cancel),
             )
           else
             IconButton(
@@ -116,7 +117,9 @@ class _CollectionsListPageState extends State<CollectionsListPage> {
               ),
               itemCount: collections.length,
             )
-          : Center(child: Text('Create your first Collection to get started!')),
+          : Center(
+              child: Text(AppLocalizations.of(context)!.tipCreateCollections),
+            ),
     );
   }
 }

lib/pages/search_page.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
+import '../l10n/app_localizations.dart';
 import '../service/search_provider.dart';
 import '../widgets/search_widgets/search_bar_widget.dart';
 import '../widgets/search_widgets/search_results_widget.dart';
@@ -12,7 +13,7 @@ class SearchPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: Text('Search')),
+      appBar: AppBar(title: Text(AppLocalizations.of(context)!.search)),
       body: Column(
         children: [
           SearchBarWidget(