To translate to other language you should copy directory kb/admin/lang/en and rename 'en' to translated language.
Made all necessary changes in .ini files and in config_lang.php
Set your language in $conf['lang'] variable in admin/config.inc.php
($conf['lang'] = 'your_language_folder_name';)
We have made some special utilities, it will display some help information:
You can find available localizations in download section.