Add customizable messages for Local (e.g. Nicknames)

[kev2k2de]

Is your feature request related to a problem? Please describe.
I have the problem that I can't edit the messages that are sent on the spigot side of the Plugin, for example the messages related to setting and changing nicknames.

Describe the solution you'd like
I'd like to have a local messages.yml file to edit those messages.

Describe alternatives you've considered

Additional context