fix: show German month name with calendar

public/typo3conf/ext/ep_products/Classes/Controller/AjaxCalendarController.php

@@ -153,7 +153,7 @@ class AjaxCalendarController extends ActionController
         }
 
         return [
-            'label' => $firstOfMonth->format('F Y'),
+            'date' => $firstOfMonth,
             'weeks' => $weeks,
         ];
     }

public/typo3conf/ext/ep_theme/Resources/Private/Templates/AjaxCalendar/Range.html

@@ -49,7 +49,7 @@
                 </tbody>
             </table>
             <div class="px-2 pt-2 text-sm font-semibold text-zinc-700">
-                {month.label}
+                <f:format.date format="%B %Y">{month.date}</f:format.date>
             </div>
         </div>
     </f:section>