zentao/extension/lite/search/ext/lang/en/lite.php

<?php
$lang->search->modules['task']        = 'Task';
$lang->search->modules['execution']   = 'Kanban';
$lang->search->modules['story']       = 'Story';

unset($lang->search->modules['case']);
unset($lang->search->modules['bug']);
unset($lang->search->modules['build']);
unset($lang->search->modules['effort']);
unset($lang->search->modules['caselib']);
unset($lang->search->modules['product']);
unset($lang->search->modules['release']);
unset($lang->search->modules['testtask']);
unset($lang->search->modules['testsuite']);
unset($lang->search->modules['testreport']);
unset($lang->search->modules['productplan']);
unset($lang->search->modules['program']);
unset($lang->search->modules['trainplan']);
unset($lang->search->modules['opportunity']);
unset($lang->search->modules['risk']);
unset($lang->search->modules['issue']);
unset($lang->search->modules['deploystep']);
unset($lang->search->modules['deploy']);
unset($lang->search->modules['service']);