A. A user on translatewiki.net has asked if GENDER is supported in message.
I have some some additional questions:
B. What's the link text of the diff link $3? A page title, so for example "User_talk:Siebrand"?
C. What does "formatted" mean in the description of $2?
 'notification-edit-talk-page' => '$2 edited your talk page $3'
Format for displaying notifications of a user talk page being edited
- $1 is the username of the person who edited, plain text.
- $2 is the username of the person who edited, formatted.
- $3 is a diff link, formatted.