add error message for game deletion and implement search functionality

lib/l10n/generated/app_localizations.dart

@@ -296,6 +296,12 @@ abstract class AppLocalizations {
   /// **'Error while creating group, please try again'**
   String get error_creating_group;
 
+  /// Error message when game deletion fails
+  ///
+  /// In en, this message translates to:
+  /// **'Error while deleting game, please try again'**
+  String get error_deleting_game;
+
   /// Error message when group deletion fails
   ///
   /// In en, this message translates to:

lib/l10n/generated/app_localizations_de.dart

@@ -112,6 +112,10 @@ class AppLocalizationsDe extends AppLocalizations {
   String get error_creating_group =>
       'Fehler beim Erstellen der Gruppe, bitte erneut versuchen';
 
+  @override
+  String get error_deleting_game =>
+      'Fehler beim Löschen der Spielvorlage, bitte erneut versuchen';
+
   @override
   String get error_deleting_group =>
       'Fehler beim Löschen der Gruppe, bitte erneut versuchen';

lib/l10n/generated/app_localizations_en.dart

@@ -112,6 +112,10 @@ class AppLocalizationsEn extends AppLocalizations {
   String get error_creating_group =>
       'Error while creating group, please try again';
 
+  @override
+  String get error_deleting_game =>
+      'Error while deleting game, please try again';
+
   @override
   String get error_deleting_group =>
       'Error while deleting group, please try again';