What about short phrases/single words that are translated in some cases but not others? Is there a path for someone external like myself to start on this?
General machine translation probably won't work well, and you may need to train an algorithm to have Mabinogi context to make it work better. It would probably be better to tackle translations individually using different resources (such as wiki, etc), since there is an end goal (the rate of translations exceeds the rate of new content).
In terms of "copy/pasting from the official servers": this isn't possible. Text is stored server-side, so we don't actually have the text to copy paste from.
I meant playing through on the official server while a logger catalogs incoming text from dialogs, which is just a very slow copy paste. I'm guessing that's how the original text was extracted (correct me if I'm wrong).