Add german translation

lib/localizations.dart

@@ -0,0 +1,63 @@
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+
+class MemorLocalizations {
+  static const delegate = MemorLocalizationsDelegate();
+
+  static MemorLocalizations of(BuildContext context) =>
+      Localizations.of<MemorLocalizations>(context, MemorLocalizations);
+
+  final String languageCode;
+
+  MemorLocalizations(this.languageCode);
+
+  bool get de => languageCode == 'de';
+
+  // Home screen
+
+  String get title => 'Memor';
+  String scheduled(String date, String time) =>
+      de ? '$date um $time' : '$date at $time';
+  String deleted(String msg) => de ? '"$msg" gelöscht' : 'Deleted "$msg"';
+  String get undo => de ? 'RÜCKGÄNGIG' : 'UNDO';
+  String get noReminders =>
+      de ? 'Keine Erinnerungen eingerichtet' : 'No reminders scheduled';
+
+  // Memo editor
+
+  String get editTitle => de ? 'Memo bearbeiten' : 'Edit memo';
+  String get addTitle => de ? 'Memo erstellen' : 'Create memo';
+  String get save => de ? 'SPEICHERN' : 'SAVE';
+  String get create => de ? 'ERSTELLEN' : 'CREATE';
+  String get memo => 'Memo';
+  String get date => de ? 'Datum' : 'Date';
+  String get time => de ? 'Zeit' : 'Time';
+
+  // Backend
+
+  String get notificationDescription =>
+      de ? 'Memors Erinnerungen' : 'Memor reminders';
+  String get reminder => de ? 'Erinnerung' : 'Reminder';
+
+  // Date utils
+
+  String get today => de ? 'Heute' : 'Today';
+  String get tomorrow => de ? 'Morgen' : 'Tomorrow';
+}
+
+class MemorLocalizationsDelegate
+    extends LocalizationsDelegate<MemorLocalizations> {
+  const MemorLocalizationsDelegate();
+
+  @override
+  bool isSupported(Locale locale) => ['en', 'de'].contains(locale.languageCode);
+
+  @override
+  Future<MemorLocalizations> load(Locale locale) {
+    return SynchronousFuture<MemorLocalizations>(
+        MemorLocalizations(locale.languageCode));
+  }
+
+  @override
+  bool shouldReload(MemorLocalizationsDelegate old) => false;
+}