Improve registration/login process if user approval required.

* Add error condition for non-approved user
* Add message on registration if approval required
Add notification emails when a user registers and when they are approved
Make email confirmation and admin approval work together
Add translations for new registration messages and emails
Make new user emails 'TO' admins, not BCC - for debugging
Fix sending notification emails to mutliple admins
Merge branch 'private-deployment-registration-727' into develop
Merge branch 'develop' of git://github.com/ushahidi/Ushahidi_Web into develop