Scripts/Commands: Move .pinfo command output hardcoded strings to DB

So they can be localized too.

Renamed LANG_BANINFO_YES and _NO to avoid duplicating the string content on the DB

Also made the original register mail to be shown as Unauthorized instead of Error when whoever used the command hasn't enough permissions to see it.
Previous indentation is actually alright, it's like that because these are all arguments of the PSendSysMessage

Same for the line below