Last modified: 2014-04-07 22:56:30 UTC
What it says on the tin.
The WMF core features team tracks this bug on Mingle card https://mingle.corp.wikimedia.org/projects/flow/cards/534, but people from the community are welcome to contribute here and in Gerrit.
I assume that the message is used in topic history, hence the tense, and so won't commit a change myself :/.
Does this bug apply to log entries too? suppression log entries aren't going to recentchanges anymore after bug 60814.
To quote Deskana, "only oversighters can see those entries in contributions now, and they can see all of it so the grammar makes sense." :)