Chat rounds speak your language
When a chat round has something to tell you — for example that no language model can currently serve it — that message is now shown in the language you selected, not always in English.
Until now those messages were written by a background step that had lost track of who submitted the message, and with it your language preference. Your name and account were carried across, but your language was not, so the text fell back to English for everyone.
Your language now travels with your message all the way to the round that answers it. This applies to every message a round writes back, including ones added in future.