Script Template Editor
Script Template Editor is a Unity extension that gives you the option to edit Unity’s default templates. If you want you can discard any changes you have made and return to the original Unity templates. You can also create your own custom templates.
I made it because I was tired of having to manually find and replace Unity’s template files with my own files every time Unity updated. I decided to put it on the Asset Store after noticing that other people online were complaining about the problem my extension was solving