Allow players to set coming and going messages

I was thinking of an interesting idea. It might be fun to allow players to set a personal message for when they join and a message for when they leave. 

For instance:
PureJaguar joined the server from United Kingdom
What's up people, I'm back!

PureJaguar left the server (Disconnected)
Later everyone! Have fun!

Maybe there could be a default message for each, but the players could change their join and leave saying with commands. 

You can just add another line in the lang file
In response to Tricky ():
You can just add another line in the lang file
I believe they are asking for personal ones, as in per user that the user can customize.
ooOoo yes, I didn't read that
It could be a cool Idea actually, might implement it in the next update.