I am using WP e-Commerce plugin. It has this line in the checkout page code.
<td colspan="2"><?php _e('Enter coupon code', 'wpsc'); ?> :</td>
I want it to say ''Enter Promo Code'
I do not want to hack the line right in the checkout page code as the plugin updates a lot.
Is there a way to change that using a function in the theme functions file?