Moved interpretation logic to a separate service TranslationManager.
some renaming:
translation bridges -> listener bridges
translator bridges -> speaker bridges
When audio exited/listen only, or interpretation is inactive, interpretation-related UI elements will now be hidden.
Clicking "End Interpretation" will now trigger an event that informs all connected clients to:
exit all listener bridges
exit all speaker bridges
join floor channel
reset floor/translation volume
After translation is started, moderators can now use the "Open all bridges" button to connect all translator bridges at once.
Fixed a bug that would cause the interpreter audio listening channel to keep opened after an interpreter has joined a speaker bridge and left again.
Channel switching now only works if the channel is not already active.
Added some error handling and robustness improvements