Learn as in be way fluent in those languages?
English even though English is the only language I can speak for the most part, I still am not on the level of major writers, and cannot understand half of what Thareous writes without referring to Dictionary.com
Arabic this was my second language at birth, but am no longer able to speak it. I can read Arabic just fine, but cannot for the life of me understand the words besides a few basics like "bayt - House" and "baidah - egg". I forgot even the months, days and colors >_>
Japanese importing dem games like SO3DC.
French Romance language, 'nuff said.
Italian see French.
[Latin if it counts, if not then Chinese] one of the origins of the English language, the words look and sound AMAZING.
[Chinese if Latin counts] Most populated place in the world besides the world itself.
Spanish It sounds really, REALLY interesting!