#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_sk.yml

@@ -13,7 +13,6 @@ reg_only: '&fVstup iba pre registrovanych! Navstiv http://example.com pre regist
 valid_session: '&cZapamätané prihlásenie'
 login_msg: '&cPrihlás sa príkazom "/login heslo"'
 reg_msg: '&cZaregistruj sa príkazom "/register heslo zopakujHeslo"'
-reg_email_msg: '&cPlease register with "/register <email> <confirmEmail>"'
 timeout: '&fVyprsal cas na prihlásenie'
 wrong_pwd: '&cZadal si zlé heslo'
 logout: '&cBol si úspesne odhláseny'
@@ -43,9 +42,6 @@ recovery_email: '&cZabudol si heslo? Pouzi príkaz /email recovery <tvojEmail>'
 # 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 kick_antibot: 'AntiBot protection mode is enabled! You have to wait some minutes before joining the server.'
-# 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_nick: '&cYou can''t use your name as password, please choose another one...'
 # TODO password_error_unsafe: '&cThe chosen password isn''t safe, please choose another one...'
 # TODO password_error_chars: '&4Your password contains illegal characters. Allowed chars: REG_EX'