Hi @youcef.ben,
thanks for the additional info!
The subtitle label bug has now also been reported here. This is where you’ll be able to track the status of the issue.
Regarding the “Subtitle appears out of the subtitle-overlay”, could you please create a new bug issue on Github here?
You are right, getAvailableVideoQualities and setVideoQuality are not implemented yet. We will get to it at some point, but we are also very open to contributions 
Greetings,
Žiga