Make based-connect work with QC35 Series 2 and new firmware

[danners]

Tested with firmware 4.8.1 and QC35 Series 2:

• Add newly supported languages
• Make language readout work
• Make setting Self voice to different levels work

No idea if this also works on older firmware / devices.

[airvzxf]

Hi, I applied your changes in a new repository that I created based on this. The idea is to have an active community to improve this genius idea.

You are welcome to visit the new repository. https://github.com/airvzxf/bose-connect-app-linux

[synchrone]

Tested this PR with firmware 2.0.1, works!