Hi everyone / @alex
Unfortunately I can not listening to the pronunciation of single words when I review my flashcards for instance (using my app). I see the speakers icon, but when I press it there are no sounds. On the site, it works completely fine.
Best,
Tobias
@tobiassimon - I tried this and it seems to be working properly. You may need to install Google text-to-speech: https://play.google.com/store/apps/details?id=com.google.android.tts&hl=en
@alex - many thhanks. It was already installed, but Arabic was not supported, so I installed another voice engine and it works now. 
@tobiassimon - Ah, good to know! We’ll keep this in mind if others report a similar issue.