Order Success page

I am trying to change the order success page. 

"Click here for a printable copy" to "Click here for a printable copy and download link"

<p><a href="<?php echo htmlspecialchars($printable_link); ?>" target="_blank"><?php echo language::translate('description_click_printable_copy', 'Click here for a printable copy and download link'); ?></a></p>
I changed the above line in order_success.inc.php but it doesn't change on the page. I cleared all of the cache locations but it still shows the original line.  Is this coming from somewhere else?
You don't need to modify any of the php files for translations. All translations are managed from "Translations" section in admin panel.
Thanks, that makes things a lot easier.