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

<?php
$lang->resource->execution->relation            = 'viewRelation';
$lang->resource->execution->createrelation      = 'createRelation';
$lang->resource->execution->editrelation        = 'editRelation';
$lang->resource->execution->batcheditrelation   = 'batchEditRelation';
$lang->resource->execution->deleterelation      = 'deleteRelation';
$lang->resource->execution->batchdeleterelation = 'batchDeleteRelation';

$lang->resource->execution->gantt        = 'ganttchart';
$lang->resource->execution->ganttsetting = 'ganttSetting';
$lang->resource->execution->ganttEdit    = 'ganttEdit';