zentao/extension/ipd/my/ext/lang/en/calendar.php

<?php
$lang->my->calendarMenu = new stdclass();
$lang->my->calendarMenu->todo   = array('link' => 'Todo|my|todo|', 'subModule' => 'todo');
$lang->my->calendarMenu->effort = array('link' => 'Effort|my|effort|', 'subModule' => 'effort');