I'm glad to see this thread, as I do a fair amount of translating and find that machine translations make good first guesses. I posted on stackoverflow a question about what all is involved in getting a google api key like the one needed for the module you use. I got nothing but crickets. I suspect it may have something to do with google's snafu with a data breach recently, where those with api keys had access to stuff they shouldn't have. Furthermore, google is one of those companies like facebook that is ginormous but has no ordinary place for users to talk to an actual person to get the skinny on something.
My question is what are the costs involved? I'm guessing that it would be a function of use, but does that mean you give them a credit card?