Hmm, it looks like the whole app was translated. Can you try to change your location using these steps: https://yt.be/help/qiig ? Let us know if that helps.
Appreciate the info. Please send a feedback report directly from YouTube with these steps: https://yt.be/help/feedback . While every individual report may not get a direct response back, we do review everything and use the details to investigate and fix issues. Thanks!