On watchlists (and other places?) each recent edit can have a flag attached to it to indicated whether it was a minor edit, bot edit, etc.. These flags are very cryptic unless you know enough to check the class name. The following patch changes them to proper <acronym> elements and gives them a title pulled from the localised messages file. I haven't contributed to Mediawiki before so I've no idea how difficult it is to push through a change that needs localising, but hey, let me know.
So is this a wanted feature? What would it take to get it pushed in?