feat(localization): add German localization

packages/stream_chat_localizations/lib/src/stream_chat_localizations.dart

@@ -19,6 +19,8 @@ part 'stream_chat_localizations_hi.dart';
 
 part 'stream_chat_localizations_pt.dart';
 
+part 'stream_chat_localizations_de.dart';
+
 /// The set of supported languages, as language code strings.
 ///
 /// The [GlobalStreamChatLocalizations.delegate] can generate localizations for
@@ -36,6 +38,7 @@ const kStreamChatSupportedLanguages = {
   'ja',
   'ko',
   'pt',
+  'de',
 };
 
 /// Creates a [GlobalStreamChatLocalizations] instance for the given `locale`.
@@ -74,6 +77,8 @@ GlobalStreamChatLocalizations? getStreamChatTranslation(Locale locale) {
       return const StreamChatLocalizationsKo();
     case 'pt':
       return const StreamChatLocalizationsPt();
+    case 'de':
+      return const StreamChatLocalizationsDe();
     default:
       return null;
   }