Topic: username/password, important addition to descriptions on forms
in lang\en_register.php, I would suggest adding a comment about which characters are allowed, e.g.:
...
'Username info' => 'Usernames can be between 2 and 25 characters long. Please use only characters a-z, A-Z and 0-9.',
'Pass info 1' => 'Passwords can be between 4 and 16 characters long. Passwords are case sensitive. Please use only characters a-z, A-Z and 0-9.',
...
we've had chinese and russian users, among others, who were confused about this when they were trying to register...