Zanata currently treat unregistered users as disabled users, however they should be different.

Consider following use case:

1. Unregistered users: The user fill the registration page but forgot to click activation link. He/she should be lead to unregistered user page to resend activation mail.

Step to reproduced:
1. Use generic open to register
2. Fill the registration form, and click *Save*.
3. Make the activation link expire by waiting for 24 hours or modify the database.
4. User log in

Expected:
Redirect to Inactivated user page

Actual:
Nothing happend


2. Disabled user (User disabled by admin): Admin wants to stop the mischievous users and set the disable flag. The users should NOT be able to reach the inactive account page.

Step to reproduced:
1. Admin disable an user account.
2. Log in as that user.

Expected:
Error messages: "Your account is disabled, please contact admin to resolve the issue".

This bug is more comprehensive and clearer version of Bug 1017101.