I installed with my own language, but the Back-end is still in English

sample-01A lot of different languages are available for the Back-end, but by default this language may not be installed. If you want a translated Back-end, get your language pack and install it using the Extension Installer. After this, go to the Extensions Menu, select Language Manager and make your language the default one. Your Back-end will be translated immediately.

Users who have access rights to the Back-end may choose the language they prefer in their Personal Details parameters. This is of also true for the Front-end language.

A good place to find where to download your languages and localised versions of Joomla! is Translations for Joomla! on JED.

Newsflash

The one thing about a Web site, it always changes! Joomla! makes it easy to add Articles, content, images, videos, and more. Site administrators can edit and manage content 'in-context' by clicking the 'Edit' link. Webmasters can also edit content through a graphical Control Panel that gives you complete control over your site.