You can view your SharePoint display language, time zone, country/region, and related settings at any time from your personal profile page, accessible from your desktop or mobile devices. If your organization policies allow it, you can also change your language and region settings. Your settings apply only to your view of your organization’s SharePoint sites and do not affect how other people view these sites.
If you're a SharePoint admin, see Change regional settings for a site to change regional settings on a site collection.
Note: If you’re working in an environment of local SharePoint sites that your organization manages—and not an Office 365 environment—your site collection administrator must make the language available for you to use before you can use the language-dependent guidance in this article.
Note: If you set your language in SharePoint Online and then change it in Office 365, the Office 365 setting will override the SharePoint setting. See Change your display language in Office 365 for more information.
Note: The features described in this article depend on whether your organization has set up or customized personal sites and user profiles. For more information, see your administrator.
To change your personal language and region settings
Click your name or picture at the top of any SharePoint or Office 365 site in your organization.
Click About me and then Update profile.
Click the link under How can I change language and regional settings?
On the Edit Details page, click the ellipsis (…), and then click Language and Region.
Update your settings. You can use the table that follows this procedure for guidance.
Click Save all and close.
The following settings can be set to apply to Everyone, or Only You. If they can't be changed, your administrator may have restricted the settings.