Enhance language dropdown button

[mariobehling]

The language dropdown button does not adhere to the design of the sidebar. The design is not a real dropdown menu. Please enhance as follows and shown in the below screenshot

• Make it into a "real" dropdown and when the user clicks another language keep showing that language in the dropdown, e.g. the user clicks on Vietnamese, then the button should show Vietnamese.
• Increase size of language symbol
• Instead of "6 Languages" simply show ❻
• Change color of font to the same as the sidebar color
• Reduce height and width of light gray button area
• Ensure spacing between "room name" and language dropdown even with long room names

[mariobehling]

Last PR does not work. Compare https://test.eventyay.com/e/a86f2bbb?side_panel=true

[nnhathung]

Hi @mariobehling ,
the fix for this issue available on #9131
Please help me to review it.

[mariobehling]

Tested it but it has some issues

• Clicking between channels sometimes plays the sound of the previous video
• Clicking between languages sometimes plays both audio channels

Reopening the issue. The previous implementation did not always work perfectly neither, but it never played two audio channels at the same time.

[mariobehling]

Reopening this issue as clicking on different streams and translations does not work properly.