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