Payment would be in BTC, yes.
As mentioned above, if the budget dedicated for translation is not escrowed, then don't expect much interest. It would also be fine if you can tell more about the subject of translation and the rate.
Better to move this topic to "services" sub-board. It will get much more attention from professionals.
Don't forget to verify portofolio if you are willing to hire someone without a previous feedbacks of his previous works.
Good luck mate.