Menu
I realize it's not a high priority item, but this bug has been around for a long time. When tapping on Community, the underlying sub-menu options appear and remain open. You can then tap on the desired sub-menu option. However, when you tap on Contribute, it does not keep the underlying sub-menu options open. Instead it immediately goes to the /contribute webpage. On slow connections and/or when the site is busy, this is really a pain. Please fix the Contribute menu so that it behaves like the other items in the menu bar.
I've created an issue on GitHub: https://github.com/Tatoeba/tatoeba2/issues/1546
It's not exactly a bug. It was intentional that the "Contribute" item would show a page that explains how people can contribute, and it was made like this back when mobile devices were not so popular :)