[fix] Added basic locatlization

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';
+}