Fix amp problem in backup mail

admin/js/dates.js

@@ -759,7 +759,7 @@ $(document).ready(function () {
       let exam_nr = obj.exam_nr;
       let lecturer_name = $("#lecturer_" + id + " .lastname").text();
       let lecturer_name_us = lecturer_name.replace(/ /g, "_");
-      let exam = $("#exam_" + id).text();
+      let exam = encodeURIComponent($("#exam_" + id).text());
       let date = $("#date_" + id).text();
       let date_reverse = date.split(".").reverse().join(".");
       date_reverse = date_reverse.split(".").join("");