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)