Change your personal language and region settings
https://support.microsoft.com/en-us/office/change-your-personal-language-and-region-settings-caa1fccc-bcdb-42f3-9e5b-45957647ffd7
To edit these language and region settings: Do this: Language Preferences. Change your preferences as follows: To change your display language in a SharePoint environment, select the Pick a new language down arrow, select a language, and then Add. If you add multiple languages, you can re-order the languages or delete a language as described ...
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