add back the course info tab in the CMS

cms/templates/widgets/header.html

@@ -27,6 +27,7 @@
     <% ctx_loc = context_course.location %>
     <ul class="class-nav inner-wrapper">
       <li><a href="${reverse('course_index', kwargs=dict(org=ctx_loc.org, course=ctx_loc.course, name=ctx_loc.name))}" id='courseware-tab'>Courseware</a></li>
+      <li><a href="${reverse('course_info', kwargs=dict(org=ctx_loc.org, course=ctx_loc.course, name=ctx_loc.name))}" id='courseinfo-tab'>Course Info</a></li>
       <li><a href="${reverse('edit_tabs', kwargs=dict(org=ctx_loc.org, course=ctx_loc.course, coursename=ctx_loc.name))}" id='pages-tab'>Pages</a></li>
       <li><a href="${reverse('asset_index', kwargs=dict(org=ctx_loc.org, course=ctx_loc.course, name=ctx_loc.name))}" id='assets-tab'>Assets</a></li>
       <li><a href="${reverse('course_settings', kwargs=dict(org=ctx_loc.org, course=ctx_loc.course, name=ctx_loc.name))}" id='settings-tab'>Settings</a></li>