I've come across a few errors in the Russian class, for example some questions only accept the feminine form of a verb as an answer when asked to supply the first person singular. It seems odd for the app to assume that I am a woman, and it would make sense to accept either the masculine or the feminine form following я. When I encounter such an error, I would like to report it right away so that the developers can know exactly what and where the problem is so that they can fix it. A feedback button would be great for this.