start
Starts live translation for the room.
Each device receives only the language it asked for — set at createRoom or changed with changeTranslationLanguage — and it arrives on RoomEventListener.onTranslationText. One device can never show two languages at once. RoomEventListener.onTranslationStateChanged tracks the service coming up.
Parameters
config
forwarded to the server unchanged; null uses the room's defaults.
Throws
code 4042 (START_TRANSLATION_FAILED) if the server refuses.