This message has been posted on their discord server yesterday, currently the app is being worked on and has no definitive ETA. We probably have to use other forks until that. I don’t know whether I can share the discord server’s link so not sharing that until a mod gives heads up.
Avatar: TLA was what actually got me into anime, which then got me into manga. But yes, manga/anime are specifically japanese comics/animated shows. While ATLA borrows quite a bit (imo) from japanese styles, it’s distinctly more like western cartoons.