Last modified: 2011-06-20 02:42:32 UTC
I deleted the page [[w:User talk:Kwami''']] (with the three trailing apostrophes), and the rest of the "Action complete" page text (including all of the tabs) appeared in bold text. Suggest somehow escaping multiple apostrophes in article titles to prevent this. Similar behavior occurs when viewing the page (The "is not registered" text is bolded in "User account "Kwami'''" is not registered.)
Fixed in r90371.
He is talking about the action complete message on deletion, not of userpage-userdoesnotexist-view,
Apparently, that's been fixed in trunk. The problem is that Wikipedia is using customised message. The fix is the same – wrap the $1 in <nowiki>.
Fixed with this edit. http://en.wikipedia.org/w/index.php?title=MediaWiki:Deletedtext&diff=435202412&oldid=407527116 Thanks for the info.