feat: feedback export to excel

addresses #869dv9k9z

templates/administrative/feedback/index.html.twig

@@ -26,6 +26,10 @@
                     Reset
                 </a>
             {% endif %}
+            <a href="{{ path('app_administrative_feedback_export') }}" class="btn btn--small" title="Nach Excel exportieren">
+                {{ icon('excel', 'w-4 h-4 shrink-0') }}
+                <span>Export</span>
+            </a>
         </div>
     </div>