Refactors Header Title

Summary:
* changes tabs to spaces

* removes `.header` class
* changes it to `.title` class
* changes markup

Test Plan:
* confirm tab to spaces
* confirm header/list-view styles are in tact

Reviewers: shadowhand

Reviewed By: shadowhand

Subscribers: rjmackay

Differential Revision: https://phabricator.ushahidi.com/D349