The android app occasionally fails to recognize Gaelic - it insists that I have typed in English.
I have had that happen too, but only when my answer is not correct. In that case, I just type "jj" (type any gibberish) so I'll get it wrong and learn the correct answer.
It is difficult to be certain but I think that it does happen when the answer is correct too.
This question is probably best for the Troubleshooting forum.
Thanks - I did not know there was such a thing.