===Acceptance criteria
* If a user has the 'Failed mention' notification preference enabled and they type a nonexistent username in an edit summary, they should receive a failed mention notification.
* If a user has the 'Successful mention' notification preference enabled and they type a valid username in an edit summary, they should receive a successful mention notification
* As only the first 5 usernames in an edit summary should send a mention, the 6th and subsequent usernames should not trigger fail/success mention notifications
* The existing bundling logic for success/fail notifications should be respected
* The existing notification icons and copy should be used (screenshot and specification below)
* The notification should link to the diff page of the mention
* These notifications do not trigger emails
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===Existing success/failure notifications
{F13937662}
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===Basic information
- **Purpose of the notification**: Let a user know when they have sent a failed or successful mention in an edit summary
- **Notification name**: Edit summary mention success/failure
- **What triggers notification?:** Linking to their username in an edit summary (e.g. Made an edit that [[User:Apples]] and I discussed on the talk page.)
- **"Notice" or "Alert"?: ** Alert
- **Notification type (standard, bundled, expandable bundle): ** Expandable bundled
==Wording==
For success:
-- **Header:** Your mention of `username` was sent.
-- **Body: ** n/a
For failure:
-- **Header:** Your mention of `username` was not sent because the user was not found.
-- **Body: ** n/a
==Links==
- **Primary link target: ** Diff page of the edit
- **#1 secondary link target:** Page where edit was page
- **#1 secondary link label: ** Pagename where edit was made