Problem/Motivation
This is a follow-up of #2988431: [Meta] Accessibility plan for Media Library Widget to fix:
After saving the media item I'm returned to the library, but it is not announced that the item is saved and added to the selection.
Proposed resolution
After clicking the 'Save and select' buttons of the add form, the outcome should be announced.
Remaining tasks
- Discuss which message we should show to the users.
- Write a patch.
- Review.
- Commit.
User interface changes
None
API changes
None
Data model changes
None