Well, it depends on the language you are translating to. Here is a list of prices that I think is pretty reasonable:
http://search.proz.com/employers/rates
They ask for a per hour bases which is a bit weird, I think per word makes more sense and is easier to check on both sides.
Anyway, I replied, it's something I would be very happy to do :)
I received an email that chess.com wants translators with pay for their work. What's in it for me? What is a reasonable wage for a language translator??