Version 1.1.21: Add the recognition of keyword {site_id} in the "template" domain list

The recognition of the {site_id} keyword in the "website template" domain name field now allows to create a generic domain that will use the back-end site ID.

This extend the same functionality added in JMS version 1.1.20 concerning the processing of the {site_id} in the "manage site" domain names.