- Updated mail notification design to be a bit prettier, and extracted
text to new lang file for translation.
- Added debounce logic for page update notifications.
- Fixed watch options not being filtered to current user.
Kept existing "COMMENTED_ON" activity for upgrade compatibility,
specifically for existing webhook usage and for showing comment
activities in activity lists.
Precursor to content notifications.
Currently untested.
Also applied some type updates.
Due to queue serialization.
Added a test to check a couple of delete events.
Added ApiTokenFactory to support.
Also made a couple of typing/doc updates while there.
Related to #4373
