In the Extensions menu, you'll also find the Language Manager. This allows you to extend the language capabilities of your Joomla-powered site; you can add new languages for both the administrative interface and the frontend of the site. To install a new language pack, click on Install Languages to see an overview of all available languages. Adding a language pack is just a matter of selecting it and clicking on the Install button. Once it's installed, it's available in the Language Manager screen and you can set the default language for both the frontend and the backend of your website.
Another great feature of the Language Manager is that it enables you to change the default texts that a Joomla site contains—just think of words and sentences such as Read more, More articles, and Details. In most cases, you won't have to bother changing them. However, sometimes the default texts don't fit your website. It's simple to remove these texts...