I guess this comes under self-improvement. I've spent the last year teaching myself French, and done pretty well (fluency in reading). I've started learning Spanish, and will likely move onto German or Italian afterwards (though I think I will only do reading and listening comprehension). Working as a translator is well paid, and to me, interesting. I've done a few small bits freelance, but turning it into a job would be beneficial, because it's something I really enjoy (I realise that sitting in an office turning one language into another isn't particularly riveting, but I enjoy deconstructing and understanding the deeper nuances of language). At a base rate, working as a translator for the EU/UN, you can make around £4,000 per year at junior level, moving up to around £13,000+ at senior level. Of course, the opportunity to get to this level requires years of practice. In general, I would recommend learning a second language (or third, fourth, etc). You never know when it will come in handy.