Added subheader to content libraries page.

cms/templates/library.html

@@ -39,7 +39,10 @@ from django.utils.translation import ugettext as _
 <div class="wrapper-mast wrapper">
     <header class="mast has-actions has-navigation has-subtitle">
         <div class="page-header">
-            <h1 class="page-header-title"><span class="title-value">${context_library.display_name_with_default | h}</span></h1>
+            <small class="subtitle">${_("Content Library")}</small>
+            <div class="wrapper-xblock-field incontext-editor is-editable"
+                 data-field="display_name" data-field-display-name="${_("Display Name")}">
+                <h1 class="page-header-title xblock-field-value incontext-editor-value"><span class="title-value">${xblock.display_name_with_default | h}</span></h1>
         </div>
     </header>
 </div>