Haskell, Erlang, Lua I do C++ and q/kdb+ professionally, plus I know enough Python to get by. The three above are pretty different and would be interesting to

Haskell, Erlang, Lua I do C++ and q/kdb+ professionally, plus I know enough Python to get by. The three above are pretty different and would be interesting to expand my horizons. Bonus question: Spanish (it's the second most common language in the States)