Update notification messages to conform to Geary Notifications Design document.

5 jobs for move_undo_to_in_app_notifications in 50 minutes and 6 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Build
passed #322057
fedora

00:31:08

passed #322058
ubuntu

00:34:42

 
  Test
passed #322059
flatpak

00:14:35

 
  Deploy
passed #322060
review

00:00:47

manual #322061
allowed to fail manual
stop_review