Honestly, I don't think it makes a difference unless you want to work for a foreign airline. English is the international language of aviation and ATC in other countries are required to speak it (with varying degrees of skill). I don't even think that my job application had a place for language skills.
If you want to actually work in a foreign country, it would be helpful though. Additionally, I have a friend who specializes in training Hispanic pilots (and I've flown with a variety of international students myself), so multiple languages could be a plus as a CFI.
BTW, in addition to speaking English and Southern, hablo espanol un poco tambien. And I can fake Canadian, eh.