#1116 #1117 Add command usage hints and remove unused message keys

- Add usage message on argument mismatch where available
- Remove unused message keys
- Create tool task to search for a message key's usages and to find unused keys

src/main/resources/messages/messages_zhtw.yml

@@ -35,7 +35,6 @@ not_logged_in: '&b【AuthMe】&6你還沒有登入!'
 max_reg: '&b【AuthMe】&6你的 IP 位置所註冊的帳號數量已經達到最大。'
 no_perm: '&b【AuthMe】&6你沒有使用該指令的權限。'
 error: '&b【AuthMe】&6發生錯誤，請聯繫管理員'
-unsafe_spawn: '&b【AuthMe】&6你登出的地點不安全，已傳送你到安全的地點。'
 kick_forvip: '&b【AuthMe】&6你已經被請出。&c原因 : 有 VIP 玩家登入伺服器'
 
 # AntiBot
@@ -86,7 +85,6 @@ email_added: '&b【AuthMe】&6已添加Email!'
 email_confirm: '&b【AuthMe】&6請驗證你的Email!'
 email_changed: '&b【AuthMe】&6Email已變更!'
 email_send: '&b【AuthMe】&6已經送出重設密碼要求至你的Email , 請查收。'
-email_exists: '&b【AuthMe】&6這個帳戶已經有設定電子郵件了'
 # TODO email_show: '&2Your current email address is: &f%email'
 # TODO incomplete_email_settings: 'Error: not all required settings are set for sending emails. Please contact an admin.'
 email_already_used: '&b【AuthMe】&4這個電郵地址已被使用。'