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Are you speaking of YouTube? YouTube has a “feature” that will auto-translate titles of videos to your account language (the creator may have to enable this, not sure).
If you google for the issue you’ll find multiple people with the same issue, but afaik there’s not really a proper way to prevent the translation. If you do understand the original language, you can add it to your account languages to stop translation though.
You can create an email alias for your Microsoft account and then only enable login from that account. If you then do not use that email for anything but the login, you should be pretty safe from credential stuffing attacks.
I had a very similar issue with multiple failed login attempts and changing my login email stopped it right away.