fix: unicode submission history (#29338)

Co-authored-by: Constanza Abarca <costi.abarca@gmail.com>

lms/templates/courseware/xqa_interface.html

@@ -29,7 +29,7 @@ function setup_debug(element_id, edit_link, staff_context){
             var location = $("#" + element_id + "_history_location").val();
             // xss-lint: disable=mako-invalid-js-filter
             $("#" + element_id + "_history_text").load('/courses/' + "${six.text_type(getattr(course,'id','')) | u}" +
-                "/submission_history/" + username_or_email + "/" + location);
+                "/submission_history/" + encodeURIComponent(username_or_email) + "/" + location);
             return false;
         }
     );