Vertimas - Portugalų (Brazilija)-Anglų - GOSTARIA DE SABER A LÍNGUA QUE VOCÊ FALA...

I would like to know exactly what language you speak.

The structure in the original seems to be wrong. It should have been:
Gostaria de saber corretamente (exatamente, ao certo) a língua que você fala.
That's a wrong use of the sentence structure in Portuguese, not unusual though.

I did'nt ask for that translation, i just translated as it came.

Lilian,

I see no problem (or inversion) in the original text. The requester is asking which language someone speaks fluently (i. e., without committing mistakes).

OK, I agree that both are "possible" grammatically, but...which one do you think is the most likely question to be made?

I'd like to know exactly what language you speak?
or
I 'd like to know what language you speak correctly?

You, as a Brazilian know that it's very common using the adverb "corretamente" as meaning: "ao certo", don't you?