Customization/translation of field in mail form page

Hello,

I would like to customize the field in mail form page

I have created a file named print_mail.tpl.php in my theme directory

I have cleared a cache and put die('Test'); in print_mail.tpl.php

When i click the icon for mailing , i do not see "Test"

I have trying with print_mail.node-my-node-type.tpl.php or print_mail.node-my_node_type.tpl.php but no results

Is there a way to customize the mail form page ?

Thank you for your help