The following are the language packs supported in SharePoint 2013.
Here I will download and install the Arabic language from the Microsoft page.
After downloaded the language pack is just mounted into the drive.
Double-click on it then click on setup.exe.
Now agree with the terms and conditions.
Now the language package installation is in progress.
Click Finish then the installation is successful.
Now the SharePoint 2013 product configuration is shown to upgrade the SharePoint products.
Click Next then click Yes then IIS has been reset for the entre product configuration wizard running.
Click Next then Run the product configuration wizard.
After the configuration wizard completes.
Now go to Central Administration.
Go to Upgrade and Migration then select Check product and the patch installation status.
Here we see the language pack has been installed successfully.
Now open the site.
Click on the setting icon at the right top of the ribbon then seelct Site settings then under Site Administrationthen click Language Settings.
In the Language Settings page select Arabic then click OK.
Go to the settings in the browser and change the language settings.
Under Advanced settings select the language and input settings.
Choose Arabic then click Add.
Move Arabic as the default language.
Now refresh the site.
Note: SharePoint 2010 has a select display language option. For 2013 this option has been removed.
The Custom Webparts titles would not be changed. Only the default SharePoint title will be changed.
In the next article I will explain how to change the custom webparts title in both languages.