Last modified: 2012-07-24 13:50:23 UTC
Created attachment 7684 [details] Screenshot showing 3 times "The thread was marked as read. Undo" insted of "The thread $1 was marked as read. Undo" The message MediaWiki:Lqt-marked-as-read-placeholder has a placeholder $1 inside, which is supposed to be replaced by a thread title. It is not, but replaced by an empty string instead, as the attached screen shot shows.
It looks like this was fixed at some point.