Change the language Office uses in its menus and proofing tools
https://support.microsoft.com/en-us/office/change-the-language-office-uses-in-its-menus-and-proofing-tools-f5c54ff9-a6fa-4348-a43c-760e7ef148f8
To change your editing language in Word for Mac or PowerPoint for Mac, go to Tools > Language, select your language, and select OK. To make it the default for all new documents select Default . Tip: To prevent having to manually configure the proofing language with each new document in Word, switch on the option to detect the language you're ...
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