Board Thread:Support Requests - Designing Your Wiki/@comment-28905188-20170801185504

On Special:AllMessages, I don't know what to search to change the message in the box that appears on your screen when someone has left a message on your talk/wall. You know, the one that currently says "You have new messages"? Like on the Harry Potter Wiki it says "you have an owl".

Wiki: Warriors World Wiki

If this question doesn't make sense, in other words I was wondering what the name of the MediaWiki page for changing that message was called. 