Change fieldset title?

Issue Summary

It always gives me great confidence when I see your name under a module, Nancy, and this one didn't disappoint. Just one question: I want to hide all references to Drupal-speak from end users, including the "Node Weight" fieldset title in the create content type form, which I would like to change to something like "Listing order".

Can you explain to me the correct way to override this title? Sorry, template.php snippets, etc, are not my strong point.

Thanks.