civicrm/civicrm-core — pull request #1425 by pratik-joshi (2013-08-13 13:28:36+00:00)
Title: CRM-13213 : updated joomla cms code for fetching UF locale

In joomla 3.1, JFactory config method $conf->getValue('config.language'); is is no longer in use.

So, to maintain joomla 2.5.x / 3.x compatibility used $conf->get('language') method.

Joomla cms usage of the same method can be seen in : joomla-root/libraries/joomla/factory.php (did some modifications to the patch submitted WRT to this).