It's a simple plugin for manage the chat with a lock and clear with no bugs.
You lock a chat? you can write with permission "chatmanager.use".
Your players make advertised with another server this plugin is solution you can clear the chat and lock it.
Prefix: "&8[&e\u2756&8] "
Lock: '&c<player> &elock the chat.'
Un-Lock: '&c<player> &eunlock the chat.'
Clear: '&c<player> &edelete the chat.'
No-Swear: '&cPlease do not swear in chat!'
/chat clear - Clear the chat.
/chat lock - Lock the chat.
Permission is "chatmanger.use".