Cryptocat 2.1.23

- Since we are currently unable to actively maintain it, Tor
integration has been removed from Cryptocat for Mac.
- Fixed a bug that could, in limited circumstances, mistakenly show
unauthenticated participants as authenticated.
- Fixed two non-time-invariant MAC comparisons.
- Fixed a bug that could allow an attacker to stall a Cryptocat
conversation.
- Fixed a bug that prevented audio notifications from playing in
Firefox on Linux.
- Many small improvements and tweaks to the code and user interface.
- Many translations have been updated.