In a course in which you possess teacher privileges: Create groups with names containing multilanguage strings, e.g. " <span class="multilang" lang="de">Abgabegruppe</span> <span class="multilang" lang="en">Submission group</span> A " Create an assignment activity and configure it as follows: Ensure that file type submission is selected.  Ensure that feedback type "Annotate PDF" is selected. Ensure that submission is available for groups only and that a group is required to make a submission. Ensure that the course has at least one participant. Ensure that said participant is a member of a valid submission group (i.e. one with a multilanguage string in its name)! Ensure that said participant has submitted an assignment in the previously created activity. Browse to the activity and click on the "Grade" button. Verify whether the grading window loads properly or throws an Error. In a course in which you possess teacher privileges: Create groups with names containing other HTML strings, e.g. " <script>Submission group</script> <b>A</b> " Ensure that those HTML tags are filtered out. (e.g. by editing that group again and checking its name)