Choose the languages you want to make available for a site’s user interface
As a site collection administrator, you can use the Multiple Language User Interface (MUI) feature to offer individual users the ability to change the display language for their site’s or to create sites in different languages than the default SharePoint language. For more information about MUI and multi-language websites, see Introduction to multilingual features.
Important MUI changes the display language for the user interface, and variations supports creating multiple versions of content that you can then have translated using machine translation services or localization professionals. There is limited support of MUI for custom user interface (UI) elements. To learn more about variations, see Create a multi-language website.
You must be signed in as a site collection administrator to choose language settings for a site. In addition, the SharePoint Server farm administrator must first deploy language packs on your SharePoint Server. By default, language packs are already deployed and available to Office 365 customers using SharePoint Online.
From a site page, click the icon for Settings , and then click Site Settings.
On the settings page, in the Site Administration section, click Language Settings.
In the Alternate Language section, check the checkbox for the languages you want users to be able to use to display their user interfaces. For example, if the only language pack installed is French, then French is the only alternate language available for you to select.
Now your users can change the display language for their personal use of the user interface; see Change your language and region settings.
After you turn on alternate languages for your site, you can create new lists or libraries in one language, then display the site in a different language, and modify the list or library name for that language. The same process works for list and library columns, and for navigation links.
Note .List items are considered content and not UI, so they will change when you choose an alternate display language.
Make sure the language packs you need are installed
For SharePoint Server or SharePoint Foundation
The list of available languages from which users can select the display language of their user interface is generated by the language packs that are installed on the server computers for your organization’s SharePoint installation. These language packs must be installed by a server farm administrator—that is, someone in your IT organization who has the appropriate permission levels to download language packs onto your organization’s server computers.
For SharePoint Online
If you’re an Office 365 administrator, language packs are already deployed and MUI is enabled by default so that you can read the SharePoint Online Administration Center in your preferred language. If you’re a SharePoint Online site administrators you won’t get MUI enabled on your site by default. You’ll need to select the preferred alternate languages for your site after the site has been created.
What is a site's user interface?
The user interface of your site refers to the elements on your screen that you use to interact with SharePoint, such as the menus, the navigation items, and the recycle bin.
With the MUI feature, you can display the following user interface elements in different languages:
Site title and description
SharePoint default menus and actions
Custom columns (list or site)
Navigation bar links
Managed metadata services
Use MUI when you want to create sites, site collections, or Web pages in a language other than the default language for your installation, or, if your site will have users who cannot work in the default language that you plan to use for the site.