Minecraft Redesigned /msg Command

I have created a pack for you to upgrade a realms or multiplayer game you have to write !msg in the chat, wait for the interface to open and indicate who you want to send a message to, and the message you want to send. I know there is a /msg command but I think it's pretty cool to customize this command with a new send message. Now you can look at what the interface looks like and what the messages look like when they are sent (it's a bit nicer isn't it ?)