I have no idea if the Romanian team still has access to the course, and don't know where else to mention this, but some of the English sentences in the course are very unnatural and/or wrong. There are numerous times when I've struggled to make an English sentence that makes sense out of the words given in the mobile app, and have frequently been marked incorrect because the most sensible sentence I've managed to make hasn't been accepted, and the "correct" answer I've been given makes absolutely no sense or is simply wrong in English.
I'm just doing the tree for fun, this isn't a major issue for me, but it is frustrating. I can only imagine that serious learners of Romanian will be even more frustrated. Most importantly, it impedes learning; when the English translation is wrong/strange/ambiguous, it means I'm not actually learning what the Romanian means.
Two specific examples:
What is the itinerary to destination?
They go on an international travel.
Both of these sentences are glaringly grammatically wrong in English, and with both of them, I'm unclear enough about what they mean that the meaning of the Romanian is also obscured.