+ cleanup a little bit
+ bump versions where applicable

#5864

+ mark as unread logic
o cleanup and modernise syntax
o show mark as read icons without hover
+ pass in i18n'd labels from Notifications widget
+ mark as read/unread logic in index

#5864

o update readme

#5864

o undo changes so that this can be upstreamed

#5864

! use .dropdown-item rather than .notification-item for notifications
! remove type declarations from DefaultController to undo breaking changes

#5864

o changes during code-review

#5864