Steps to reproduce:
Visit https://commons.wikimedia.beta.wmflabs.org/wiki/Special:GWToolset
Click submit without filling out the form

Actual result:
The following form field must be filled in: * gwtoolset-mediawiki-template-name <span id="back-text">&lt;noscript&gt;Press the browser back button to go back to the form. &lt;/noscript&gt;</span>

Expected result:
HTML is parsed

Note: Not sure if this happens on the real commons