/manage
I still think there could be a fairly easy fix for this issue. I think we should approach this on 'per language' basis, as that's how translations work. As we already have filters for RC per language, we should have a special page that displays source and translation, as well as 'diff with previous version', if any, similar to 'review' mode of Special:Translate.
As most functionality to accomplish this is already present, I think this shouldn't take more than 12 hours to get done.
Hmm, you were talking '/manage', not review/translate mode, right? :)
Not sure if that's too helpful. We have, or at least will end up when growing, with multiple maintainers of supported products. While I do expect PageTranslation to be used a lot by others, I don't expect UI (source file based) translations to get as big a user as twn is elsewhere. Managing changes on a per-group level keeps things manageable, having 'all changes' will lead to unneeded errors with little efficiency gains, IMNSHO.