Resolve: Editing a lab changes to us format

What does this mr do?

It solves a bug where no code would be executed because of missing brackets in javascript code, and thus the date would automatically change to US format. It also solves #316 (closed), which has the same issue.

Actions taken to fix bug

Finish the brackets in the javascript snippet of /lab/edit.html

Does this MR meet the acceptance criteria?

• I have added a changelog entry to reflect the significant changes I made and the bug I fixed.
• A test was created to test the bug.
• I have updated the documentation accordingly.
• I adhere to the style guide.

Closes #312 (closed) Closes #316 (closed)

src/main/resources/templates/lab/edit.html

@@ -290,6 +290,7 @@
                 } else {
                     $('#percentageExamLab').prop('disabled', true)
                 }
+            });
         });
     </script>
 </section>