feat: refactoring of xml parsers

templates/booking/index.html.twig

@@ -69,13 +69,11 @@
                             </a>
                         {% endif %}
                         <a href="{{ path('app_booking_confirmation', { 'id': booking.id }) }}"
-                           class="button bg-button button--small"
-                           target="_blank">
+                           class="button bg-button button--small">
                             Bestätigung
                         </a>
                         <a href="{{ path('app_booking_documents', { 'id': booking.id }) }}"
-                           class="button bg-button button--small"
-                           target="_blank">
+                           class="button bg-button button--small">
                             Reisedokumente
                         </a>
                     </div>