Add nickname messages to messages.yml

[kakduman]

Is your feature request related to a problem? Please describe. I'd like to change the nickname modification message from the default ("&aThe nickname has been set!") to "&6Your nickname is now %DISPLAYNAME%&6." Unfortunately, the plugin doesn't seem to have a way to do this yet.

Describe the solution you'd like Could you add a way to modify the nickname change message to the messages.yml? I'm not experienced with coding, so unfortunately I don't think I'd be able to make a pull request.

Describe alternatives you've considered I've thought about using another plugin to change "&aYour nickname has been set!" to "&6Your nickname is now %DISPLAYNAME%&6." Ultimately I decided against it since I feel like it'd be better for other people and me if the feature was implemented into this plugin rather than using a separate (and glitchy) plugin.

Thanks for the help!