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

app/Http/Middleware/SetLocale.php

@@ -21,7 +21,7 @@ class SetLocale
         $sessionLocale = Session::get('locale', 'de');
 
         // Fallback to Accept-Language header if no session
-        if (!in_array($sessionLocale, $supportedLocales)) {
+        if (! in_array($sessionLocale, $supportedLocales)) {
             $acceptLanguage = $request->header('Accept-Language', 'de');
             $localeFromHeader = substr($acceptLanguage, 0, 2);
             $sessionLocale = in_array($localeFromHeader, $supportedLocales) ? $localeFromHeader : 'de';