Sorry for the necroposting, but I was interested in this kind of feature too and I thought it made more sense to up an existing thread where someone already requested it rather than making a duplicate one.
Being able to write a card name in another language would make it really easier to update the inventory for the people that don't use (or not only) english card. If that could also fill up the language to the one of the name inserted it would be a plus, but not the main point.
Cheers.