Fix Event & EventType resource issues and apply formatting

- Fix EventType deletion error handling (constraint violations)
- Fix Event update error (package_id column missing)
- Fix Event Type dropdown options (JSON display issue)
- Fix EventPackagesRelationManager query error
- Add missing translations for deletion errors
- Apply Pint formatting

resources/lang/de/admin.php

@@ -25,6 +25,7 @@ return [
     ],
 
     'common' => [
+        'error' => 'Fehler',
         'key' => 'Schlüssel',
         'value' => 'Wert',
         'locale' => 'Sprache',
@@ -466,6 +467,9 @@ return [
             'icon' => 'Icon',
             'created_at' => 'Erstellt',
         ],
+        'messages' => [
+            'delete_constraint_error' => 'Dieser Eventtyp wird derzeit verwendet und kann nicht gelöscht werden.',
+        ],
     ],
 
     'tasks' => [