wolfhoundjack wrote:well, either our first attempt at a translation was ceart go leor or it was so wrong as to be offputting.

It's not correct, I'm afraid. While it's vaguely possible that folks found it off-putting (you didn't imagine the eye-rolling), I don't think that's why it hasn't had any response. This is a fast-moving forum, and it's more likely that folks just didn't notice it, or weren't quite sure what to do with it (I thought about taking a stab at it, most of the words I can think of in Irish for "charm" have more to do with rituals for warding off harm and the like...not the kind of "good luck" pieces this commercial intended).
In any case, if you keep an eye on this thread, and bump it back up by posting a reply to it when it looks like it will rotate off the page without resolution, I'm sure someone will give it a go.
Redwolf