Do not update/delete: Banner broadcast message test data
Admin message
Do not update/delete: Notification broadcast message test data
Mentions do not work correctly
Mentioning users with a username starting with a number not picked up. The regexp used for username validation
/\A[a-zA-Z0-9_.][a-zA-Z0-9_\-\.]*(?<!\.git)\z/1
should be the same as the one (except @) used for collecting mentions /@[a-zA-Z][a-zA-Z0-9_\-\.]*/2