[Koha-devel] Creating new template.

Hi, I want to create a new template for a custom action in the patron details. What I need is to call a web service to update some data of the patron but only is the staff wants (Ideally it will be called on a cron job at midnight). I have two languages English and Spanish, do I need to change both views of the *koha-tmpl/intranet-tmpl* or should I change the English one and the regenerate them? Thanks for any help! Regards Rodrigo