Wikimedia Bugzilla is closed!

Problem is with [[ar:ميدياويكي:Common.css]] which contains 
div#content ul {
    display: table;
}

This can be fixed by adding
div#catlinks ul {
    display: inline-block;
}

Thank you Mark

This is broken again because "div#catlinks ul" was replaced with "#catlinks ul" and CSS says (in firefox and opera at least) that "div#content ul" as overriding "#catlinks ul" because it is more specific.  See http://www.w3.org/TR/CSS2/cascade.html#specificity and http://www.w3.org/TR/CSS2/cascade.html#cascading-order for more info.

ooh! fixed again.