For youtube i recommend to use invidious a great frontend , you can locale it in any languages.
You can show youtube vids or download them in the quality you want and it's adds free.

https://invidio.us/

The quality can be set in parameters but if old vids are availaible in small quality most of the new vids are in 720p mini so don't expect to show them properly if you have a slow machine.

Regards