zentao/extension/ipd/common/ext/lang/en/gantt.php

<?php
$lang->execution->menu->view['subMenu']->gantt = array('link' => 'Gantt|execution|gantt|executionID=%s', 'alias' => 'maintainrelation,relation,createrelation,batcheditrelation');
$lang->execution->menu->view['menuOrder'][5]  = 'gantt';

$lang->project->noMultiple->scrum->menu->view = $lang->execution->menu->view;