Editing notification text in editor overrides translations without a way to go back

### Reproduction Steps

* Set language to something else than English
* Notifications are now translated to your chosen language as long as you have existing translations
* Go to LifterLMS -> Settings -> Notifications
* Pick Basic or Email for any item in the list
* Edit Title or Body
* Save Changes
* Edit Title or Body again to revert your changes
* Save Changes

### Expected Behavior

When I revert to the original text, the system should realize that it should use what's found in loaded translation files. Alternatively, there should be a "reset" or "revert" button in the editor, which would make the system to respect translations again.

### Actual Behavior

As a result, your edits override whatever translation you had for the notification. If you go back and revert your edits, the notification still stays in English, and you can no longer use the translations provided in translation files.

### System and Environment Information

LifterLMS 8.0.1

This issue has be recreated:
+ [x] On a production website

### Browser, Device, and Operating System Information

+ Firefox
+ MacOS