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Thank you for re-translating and editing this issue.
According to my research, the language of these notifications may be related to your location. I changed my address in my test account, and the Microsoft notification language I received still shows my current address.
And the language of the incoming file in the inbox is set by the sender, I am afraid that there is no way to change the displayed language. As an alternative, you can only meet your needs through translation.
Hope this helps!
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