#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_zhcn.yml

@@ -21,7 +21,6 @@ no_perm: '&8[&6玩家系统&8] &c没有权限'
 error: '&8[&6玩家系统&8] &f发现错误，请联系管理员'
 login_msg: '&8[&6玩家系统&8] &c请输入“/login <密码>”以登录'
 reg_msg: '&8[&6玩家系统&8] &c请输入“/register <密码> <再输入一次以确定密码>”以注册'
-reg_email_msg: '&8[&6玩家系统&8] &c请输入 "/register <邮箱> <确认电子邮件>"'
 usage_unreg: '&8[&6玩家系统&8] &c正确用法：“/unregister <密码>”'
 pwd_changed: '&8[&6玩家系统&8] &c密码已成功修改！'
 user_unknown: '&8[&6玩家系统&8] &c此用户名还未注册过'
@@ -68,9 +67,6 @@ invalid_name_case: '&8[&6玩家系统&8] &c你应该使用「%valid」而并非
 # TODO denied_command: '&cIn order to use this command you must be authenticated!'
 # TODO same_ip_online: 'A player with the same IP is already in game!'
 # TODO denied_chat: '&cIn order to chat you must be authenticated!'
-# TODO reg_no_repeat_msg: '&3Please, register to the server with the command "/register <password>"'
-# TODO reg_email_no_repeat_msg: '&3Please, register to the server with the command "/register <email>"'
-# TODO reg_psw_email_msg: '&3Please, register to the server with the command "/register <password> <email>"'
 # TODO password_error_chars: '&4Your password contains illegal characters. Allowed chars: REG_EX'
 # 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.'