I checked textmaster, and they seem to have fixed translation pricing. 1000 translated words is about $40. gengo is even more expensive. I can get 1000 translated words on some sites like Fiverr for $5, but its kind of a pain to search, buy a gig, send the content, get it back... and do that for 20 or so different languages, but it is the cheapest way I have found.
I recently read a book about this very concept, the author went over hundreds of studies like the one you just read and has some interesting conclusions, in the book titled "An Epidemic of Absence"
which is a more generic version of another similar service http://pizzaforcoins.com/
It may be a matter of time before any site can accept bitcoins indirectly if people started using these services.