zentao/extension/ipd/file/ext/lang/en/zentaobiz.php

<?php
if(isset($lang->excel))
{
    $lang->excel->title->feedback = 'Feedback';
}

$lang->file->officeBusy    = 'Office is busy. Wait a second.';
$lang->file->collaboraFail = 'Access Collabora Online failed. You can try to restart, or check configuration problems. Make sure that %s/hosting/discovery access.';
$lang->file->drag          = 'Please drag the file to here.';
$lang->file->track         = 'Track';