Live English and Arabic subtitles for the stage screen and attendees' phones.
Everyone on the team must use the same id, so the screens and phones see the same session.
For the operator. Pick the microphone, start and stop, blank the screen, change the style.
The subtitle overlay for the stage screen. Transparent by default; add ?bg=black or ?bg=green to test.
What attendees see after scanning the QR code. English or Arabic, no login.