fix: include all board services when importing travel data

public/typo3conf/ext/ep_products/Classes/Service/DateImportService.php

@@ -394,7 +394,7 @@ class DateImportService implements SingletonInterface, LoggerAwareInterface
         $date['services_included'] = serialize($includedServices);
 
         if ($includedBoard) {
-            $date['board'] = reset($includedBoard);
+            $date['board'] = implode(', ', $includedBoard);
             $date['board_bus_pro_id'] = key($includedBoard);
         }