While the initiative is great, I think that you're doing it wrong.

First of all, aside of the posts where these guys are exposed, their usernames have to be in a properly visible list in the start of the thread, else nobody will search.

I'd add even more: maybe put in the same topic a list of good translators and a list of bad translators. This way whoever is looking of a translator can see who should he prefer and who he should avoid.
So maybe a "supporting" topic, only with these lists, is the next step to be done.