Last modified: 2012-08-22 11:12:59 UTC
The message pagetriage-mark-tooltip says: "Mark page as reviewed (or unreviewed if already reviewed)" It is very confusing. It should just show the current appropriate action.
Good catch! I agree this should be changed to a conditional tooltip, which would either show this phrase, depending on the review status: "Mark this page as reviewed" ... or this phrase: "Mark this page as unreviewed"
Fixed in: https://gerrit.wikimedia.org/r/#/c/20827/