$this->loadLanguage('plg_system_myplugin');
$this->loadLanguage('plg_content_myplugin', JPATH_SITE, 'en-GB');In this example, the language file `plg_content_myplugin.ini` is loaded for the plugin from the `JPATH_SITE` directory and in the `en-GB` language. These examples are part of Joomla CMS and are part of the language translation system. The package library is a PHP Plugin that is used in Joomla CMS.