How do I make the version comment required for wiki updates?

As of SourceForge 4.3 SP1, you can use Velocity to customize the pages of SourceForge and make the version comment required. Simply create /usr/local/sourceforge/sourceforge_home/templates/body_footer.vm with the contents below.

<script>
var updateButton = document.getElementById('edit_wiki_page.update');
if ( updateButton ) {
updateButton.href = 'javascript:submitWikiPageUpdate();';
}
function submitWikiPageUpdate () {
if ( document.editPage.versionComment.value ) {
submitForm(document.editPage, 'submit');
return;
}
alert("Please include a detailed Version Comment for this change.");
}
</script>

Then, make sure the file is owned by the sf-admin user:

chown -R sf-admin.sf-admin /usr/local/sourceforge/sourceforge_home/templates 

And ensure proper permissions:

chmod 0644 /usr/local/sourceforge/sourceforge_home/templates/body_footer.vm 

SourceForge picks up the change immediately.