Changing the backend language
By default, TYPO3's backend is set to English with no additional languages available.
Table of Contents
Set your backend language
One of the available backend languages can be selected in your user account.
Go to Toolbar (top right) > User Avatar > User Settings and select the new language from the field Language:

Changing the current user's interface language
If the desired language is not available, administrators with system maintainer permissions can Load an additional language pack in the Admin Tools.
Save the settings and reload the browser content.
Note
This change only applies to your account.
Change the backend language of another user
As an administrator you can change the backend language of another user.
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Go to System > Backend Users
Backend User Listing
- Select the user
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Change the language
Select the new language from the field User Interface Language.
Change interface language for a backend user