#1055 Remove multiple "please register" messages

Part 1:
- Use only one message entry for "Please register", that may have to be adapted to reflect the proper /register arguments
- Remove other message entries from code and from the messages files

Breaking change: reg_email_msg is also removed

src/main/resources/messages/messages_zhmc.yml

@@ -20,7 +20,6 @@ no_perm: '&4您沒有執行此操作的權限!'
 error: '&4發生錯誤!請聯繫伺服器管理員!'
 login_msg: '&c [請先登入] 請按T , 然後輸入 "/login [你的密碼]" 。'
 reg_msg: '&3[請先注冊] 請按T , 然後輸入 "/register [你的密碼] [重覆確認你的密碼]" 來注冊。'
-reg_email_msg: '&3[請先注冊] 請按T , 然後輸入 /register [你的電郵地址] [重覆確認你的電郵地址] 來注冊。'
 usage_unreg: '&c使用方法: "/unregister <你的密碼>"'
 pwd_changed: '&2密碼已更變!'
 user_unknown: '&c此用戶尚未注冊!'
@@ -72,3 +71,6 @@ kicked_admin_registered: '管理員剛剛註冊了您; 請重新登錄。'
 incomplete_email_settings: '缺少必要的配置來為發送電子郵件。請聯繫管理員。'
 recovery_code_sent: '已將重設密碼的恢復代碼發送到您的電子郵件。'
 recovery_code_incorrect: '恢復代碼錯誤!使用指令: "/email recovery [電郵地址]" 生成新的一個恢復代碼。'
+# TODO email_show: '&2Your current email address is: &f%email'
+# TODO show_no_email: '&2You currently don''t have email address associated with this account.'
+# TODO email_send_failure: 'The email could not be sent. Please contact an administrator.'