The rollback link contains '[' and ']' characters. This prevents skin developers (e.g. Minerva) from skinning the link.
We've made good progress in core moving away from hardcoded parentheses and should do so here as well.
<span class="mw-rollback-link">[<a href="/w/index.php?title=Talk:Qatar&action=rollback&from=Jdlrobson&token=ad3b6091b6a61e78107d8aa73f00557b5ca3ef2d%2B%5C" title=""Rollback" reverts the last contributor's edit(s) to this page in one click" data-mw="interface">rollback more than 10 edits</a>]</span>
Replication steps
You can enable rollback rights for all logged in users on your local instance using
$wgGroupPermissions['user']['rollback'] = true;
