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

What languages are supported by Joomla! 1.5?

Within the Installer you will find a wide collection of languages. The installer currently supports the following languages: Arabic, Bulgarian, Bengali, Czech, Danish, German, Greek, English, Spanish, Finnish, French, Hebrew, Devanagari(India), Croatian(Croatia),...
I installed with my own language, but the Back-end is still in English

How do I localise Joomla! to my language?

GeneralIn Joomla! 1.5 all User interfaces can be localised. This includes the installation, the Back-end Control Panel and the Front-end Site.The core release of Joomla! 1.5 is shipped with multiple language choices in the installation but, other than English (the...