I've attempted to patch DoY but I wasn't very good at getting the translation on there. I'll probably import it in the future, or... I'll just wait, import a PS Vita TV, and play Memories of Celceta on it (Memories of Celceta is confirmed for support with the PS Vita TV BTW).
Dude, if you have played MotS (which is pretty much crap and the worst Ys game in my eyes), then you have no excuses to play DoY! Celceta has nothing to do with MotS and DoY, so play it!