Hello, fellow spanish player here!
I know there's been plenty of requests already for a spanish translate of the game, but that's not my point. My suggestion sparked in a random dungeon, playing with a tank that didn't understand english, yet he marked english only in his duty options.
I thougt adding more languages to the duty finder options, even if they're not supported in the game translation, would be useful in scenarios with non-JEDF speakers to understand others by marking their languages directly on search info.
So, just adding more letters to the J E D F options would be a great addition (like S for spanish, I for italian and so on) and doesn't require a full translate of the game.