Dia daoibh!

I'm using Rosetta Stone to learn Irish, and I'm fairly certain I've found a mistake. One of the exchanges it teaches is the following:

"An labhraíonn tú Gaeilge?"
-"Labhraíonn. Labhrím Gaeilge."

Besides the fact that this means something more along the lines of "Do you speak Irish day-to-day?" and that "An bhfuil (an) Gaeilge agat?" is the right way to ask if someone is able to speak Irish, isn't Rosetta Stone incorrect regarding using "labhraíonn" as the affirmative? Shouldn't the reply be "Labhrím. Labhrím Gaeilge"?

Go raibh maith agaibh!

EDIT: Seems Gramadach na Gaeilge contradicts what I wrote. From it I gather that synthetic forms are possible (and quite popular) in short answers.

Thus, you are right, “Labhraím.” is possible as an answer to “An labhraíonn tú Gaeilge?”.

I need to dig in Polish textbook for Munster Irish (An Ghaeilge by A. Doyle and E. Gussmann), as I’m pretty sure it did suggest using analytical forms in this context…

EDIT2: And again my bad – it does suggest synthetic short answers, giving examples such as: “An dtuigeann tú?” “Tuigim.”, “An ndeineann sí obair gach lá?” “Ní dheineann”, “An nglanann tú an chistin ar maidin?” “Ní ghlanaim”, “An stopaimid anso?” “Ní stopaimid.”, “An bhfuil tú sásta?” “Nílim.”.

I don’t know where the idea of using only analytic form in an answer occurred to me then?

And you are right in both cases, certainly “Labhraím.” is a correct answer to “An labhraíonn tú Gaeilge?”, and “An bhfuil Gaeilge agat?” would be a more idiomatic way to ask whether someone is able to speak Irish.

I removed my old, wrong response.

Of course, English questions like "Do you speak Irish?" in the sense of "Are you able to speak irish?" cannot be translated "An labhraíonn tú Gaeilge?" (utter nonsense ) but only "An bhfuil Gaeilge agat?"

Quite a lot of people "have" very good Irish but don't speak it on a daily basis (due to a lack of collucators around them.)
So, someone could say: "Tá Gaeilge agam ach ní labhraím í."

Apart from this,
"Labhraíonn. Labhraím Gaeilge" is prob. a syntactic Béarlachas. (Labhraíonn for "Yes". Labhraím Gaeilge for "I speak irish" -> "Yes, I speak Irish")
I'd guess a native speaker would rather say "Labhraím. Labhraím Gaeilge." (or just "Labhraím Gaeilge" or just "Labhraím").