Simple UI polishes

[Zu-shi]

• After a user registers and log out, the login page still displays the "thanks for registering!" message.
• Make sure that all users-only pages redirect to log in page when not logged in (via routes.php).
• Add log page should redirect to log in page using routes.php instead of its current implementation.
• Redirecting to the log in page should have an error message about needing to log in for access.
• When logging in and you type in the wrong password, your email should pre-populate the email field.