Last modified: 2008-02-05 18:53:20 UTC
In ParserFunctions.php there is wfMsg( 'pfunc_max_ifexist_category' ) but it should be wfMsgForContent( 'pfunc_max_ifexist_category' ) If you now just change your user interface language, you see the category in that language. With wfMsgForContent you'll see it in the normal content language.
fixed with r30857.