Did it? Just checked and my feed is still completely untranslated. I have my settings set as English. I hope they don't do the weird YouTube thing of translating things from languages you know into the language you set. Multilingual people exist
The feature only rolled out to me today and I think it started rolling out to people only a couple days ago.
It's only rolling out in past 1-2 days, and also English speaking users are already running low on sanity from being constantly exposed to Japanosphere norms. We'll see how long this experiment is going to last...