You can customize notifications by modifying the existing template files or by replacing the files with custom templates that you create yourself. You can also edit the text strings and images used in the notifications.
Before making any customizations, first back up your original notifications folder. In addition, ensure that any customized files are backed up before performing a product upgrade or applying a cumulative refresh or fix pack, as you might need to merge your changes again manually after making updates.
Parent topic: Customizing
Customizing notification strings
Customizing product strings