I'm using a relatively fresh installation of Firefox on Windows 11 and my system language and browser UI language are both Japanese. Almost all of the UI is in Japanese (which is fine. I'd assumed it was just a bad translation, but maybe the UI is machine translated?), and, interestingly, if I write something in the game chat, it gets automatically translated. For example, I wrote a comment that went "Sorry, something something something..." and it got rendered as "すみません, something something something..."
My mobile app has the same bad UI translations, though I don't use the chat on mobile, so I don't know if it's doing the machine translation there.
Is there a way to disable all automatic translation on the site (especially for the chat)? It is extremely annoying to try to talk to someone in a language you both speak and to have both sides of the conversation getting translated into shitty machine-translation.