Clean up headers

Updates headers to match style guide and makes them consistent
throughout pages in the GUI. Removes instances where a header
element existed and a different header style was being applied.
For example, <h2 class="h4">

Tested: Ran GUI locally and verified that headers look consistent
and have the appropriate sizing while using Chrome, Firefox and
Safari.

Change-Id: I187136298ed2bfd36c40c2b80d5a4f20947cbe56
Signed-off-by: beccabroek <beccabroek@gmail.com>
diff --git a/app/users/controllers/user-accounts-controller.html b/app/users/controllers/user-accounts-controller.html
index fd9d7cf..9c80da6 100644
--- a/app/users/controllers/user-accounts-controller.html
+++ b/app/users/controllers/user-accounts-controller.html
@@ -33,7 +33,7 @@
   <form  role="form" class="user-manage__form">
     <section class="row column" aria-label="user manage form">
        <div class="column small-12 page-header">
-        <h2 class="inline h4">User account settings</h2>
+        <h2 class="inline">User account settings</h2>
        </div>
         <div class='col-sm-12'>
           <label class="col-md-1 control-label" for="user-manage__username">UserName</label>