Greasy Fork is available in English.
Automatically attempts to rejoin when the room is full.
Yeah, it's a bit janky. I should probably check the visibility of the windows instead of waiting for a fixed amount of time. You can increase the delays to reduce the chance of a freezeup.
How do I run it properly? When I press the join button, the join window closes quickly and then the lobby window becomes frozen until I refresh the page.