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Select Extensions → Language Manager from the drop-down menu on the back-end of your Joomla! installation.
In the Language Manager you can set the default Language for both the Front and Back end of your Joomla! web site.
Both the Site and Administrator tabs have the following column titles. These details are fetched from the XML file included in the language pack.
At the top right you will see the toolbar:
At the top left, above the columns, you will see two links as shown below:
You can switch between the already installed languages for the Site and the Administrator by selecting the desired language and clicking on the Default icon on the upper right part of the screen.
The switching between the languages does not respect the users presettings in User Manager. If you switch to another language, the user can view the site on that language they have preset in their user settings.
Important: Do not delete the default language files by using FTP because it generates an error both of frontend and backend!
Joomla! allows registered users to select a preferred language in the front-end. Extra languages can be added using the Extension Manager
New languages are installed with the help of the Extension Manager, then they appear in the Language Manager for configuration. You can select either Site or Administrator to display the languages for these interfaces. You can set the site in one language and administration to another. Individual articles can also be configured to use a different language (in the Advanced Parameter pane when editing the article).
The languages listed in the Language Manager can be installed in the Extension Manager from Extensions -> Install/Uninstall menu item. The unnecessary languages can be removed on the Languages tab of the Extension Manager.
When several languages are installed, the default interface language can be overridden by a registered user on the Edit Your Details screen opened from User Menu -> Your Details menu item in the front-end after logging in. Users with administration privileges (managers, administrators and super administrators) can select the language of the back-end as well.
The selected language is displayed for the appropriate user in User Manager parameters.