feat: name the accommodation booking PDF after its record label

src/Service/AccommodationBookingPdfGenerator.php

@@ -93,7 +93,7 @@ class AccommodationBookingPdfGenerator
         $parts = array_filter([
             $booking->getDateFrom()?->format('Y-m-d'),
             $booking->getAccommodation()?->getCalendarCode(),
-            'Buchung',
+            $booking->recordLabel(),
         ]);
 
         return implode(' ', $parts).'.pdf';