[#31785] Updated files for unifying structure on com_users frontend views.

A cleaned version of PR #1786 for staging.

JC tracker:
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=31785&start=0
# Testing

Check that these pages on the frontend look consistent and no issues are present.

* Login page
* Logout page
* Profile page
* Profile edit page
* Registration page
* Reminder page
* All password reset steps pages