* Normalize and correct linphone color
* Add border when user focus using keyboard navigation
* Correct some keyboard navigation
* Add accessibility screen reading to interactive elements except chat and meeting
- Wires Set/Unset Admin to model function
- Fixed "is(not) now admin" messages inversion
- Fixed event log list not updating (building ID from timestamp and type)
- Updated text to reflect that a participant can no longer be in a conversation without an explicit "leaving" action from him (admin removed for example)
