fix for BIESt 609, closes #609

Closes #609

Merge request studip/studip!833

resources/assets/javascripts/bootstrap/application.js

@@ -66,6 +66,11 @@ jQuery(document).on('click', '.messagebox .messagebox_buttons a', function () {
     return false;
 });
 
+STUDIP.ready(function() {
+    //Set the focus on the modal overlay dialog, if any:
+    $('.modaloverlay').find(':focusable').first().focus();
+});
+
 
 /* ------------------------------------------------------------------------
  * application wide setup

resources/assets/javascripts/lib/dialogs.js

@@ -17,6 +17,9 @@ const Dialogs = {
             })
         );
 
+        //Set the focus inside the confirm dialog:
+        $(confirmDialog).find(':focusable').first().focus();
+
         return false;
     },