Small changes to forgot password results

[kenwalker]

At the moment, after pressing the Go button, it says "Your new password has been sent to you", however that password has a limited timespan. So the message should be more along the lines of "A temporary password has been mailed to you, change your password using the admin page on your account as soon as possible".

Second, if there's no email on file for an account and the user attempts to reset their password perhaps the message should be "There's no email on file for this user, please contact your park Prime Minister to add one" ?