To tell you the truth, I haven't understood much of what you said, and since I don't speak Spanish, posting the request in that language won't help either.
But hey, I'll give it a try. So for what I think I understood, you want to translate in Spanish the Fire Emblem Treasure pages with the help of the English version made by North2, right ?
Since it's him who did that translation work, you'll have to ask him. But I have to warn you, I haven't seen him for a VERY while, so...

That being said, if I could give you an advice, you're better off translating straight from Japanese to Spanish, because if you try translating from those two languages passing through English, there may be errors in the final Spanish translation.
I know this by experience, since my first French FE translation works were made through English translations of Japanese works, and now that I'm studying Japanese and am able understand a fair bit of it, I can see a lot of errors in those works due to English sentences having double meanings ; if I were able to understand Japanese at that time, I would have had the correct meaning, and thus, would have made those errors in the final French translation.