I think something might be going wrong on this one (pt 2 of genitive lesson). I translated the sentence as "the girls' clothes". I got an "almost right" response showing the correct response as "the girls clothes" - without any apostrophe, which is not right. It does list, however, my translation as the Another Translation.
The new tree is one that is under construction behind the scenes. The team of volunteer moderators are not only adding more sentences but more interesting categories, they are correcting some mistakes that we've come across over the years. In all, there will be a fresh tree based on all we've learned working on this tree. When it will be out can't be predicted yet. As I said all those working on it are volunteers which means their time is limited but more importantly they are making every effort to make this tree not only better but troublefree.
You're really welcome and we love to hear that we're getting some things right. Yes, that apostrophe is a real downer and correcting it is out of our hands. We try to make up for it by having as much as possible well done. Duo is so complex there is always something that needs to be fixed.