The template documents are runtime components, so when you change them you do not need to recompile the ITP Model. This makes maintenance of the template documents very easy. Simply change the template document, test the model and you will immediately see the results of your changes.
The description below let's you change the documents in the labels folder immediately. However, in a "real" setup, you would make the changes through the ITP/MDK Repository and redeploy the documents. We advise to use the ITP/MDK Repository, because this application offers you version control.