During logout we don't have enough time.

Otherwise rooms cannot be exited properly.

Also, no need to call `_tearDown` in `logOut` when `connection.disconnect` gets
called since it will get called afterwards in the handler.

Currently translated at 88.2% (241 of 273 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/de/

Most notably, make toolbar same color as chat head and make private chats green
instead of orange.

Otherwise carbons aren't re-enabled after reconnection.

There's nothing about them that's view specific.

Also including css fixes around the unread messages indicator.