Wikia:Forum-notification-user2-reply-to-your/qqq

Notification when 2 users reply on the logged in user's thread. Parameters:
 * $1 and $2 are names of users that replied (GENDER is supported in this message).
 * $3 is the name of the board that the reply was left on.
 * $4 is the username of the registered user seeing this message (for GENDER support).