Messages
All messages are configurable in the messages.yml. Plugin uses MiniMessage format, you should really give a read to it's documentation.
Why MiniMessage?
Legacy colors has much less power and less readable, comparing to minimessage tags. They are more verbose, but giving you a lot of power. You can use translatable components, Make clickable and hoverable messages, and have gradients that doesnt look like a mess.
Placeholders
You can globally define a plugin prefix and use it everywhere. There's special placeholders for clan, clan member, and clan home, so you can get any information you need to display.
For example:
preparation-title: '<first_display_name> <reset>vs <second_display_name>'
or
accepter-message: '<prefix> <click:run_command:''/clan war accept <tag>''><red>Click here</red></click> to accept the request or run /clan war accept <clan_tag>'