zentao/extension/ipd/action/ext/lang/en/traincourse.php

<?php
$lang->action->objectTypes['traincourse']   = 'Course';
$lang->action->objectTypes['traincategory'] = 'Course Category';
$lang->action->objectTypes['traincontents'] = 'Course Contents';
$lang->action->objectTypes['practice']      = 'Practice Library';