Getting the templates back is not possible because SMemo is software which comes with the operating system of your Galaxy S3 device. In order to restore the templates, you will have to install the application again, but that involves in obtaining the application from someone who rooted their phones and extracted the APK package.
On the other hand you can perform a factory reset that removes all your applications that are installed on the phone (not on the external device). First, backup the data from the phone, using Kies and then perform a factory reset using Factory reset option found in the settings menu under Privacy.