Add tab to go back to track

lms/templates/courseware/course_navigation.html

@@ -76,6 +76,18 @@ def url_class(is_active):
           </li>
       % endfor
       <%block name="extratabs" />
+      <%
+          course_id = unicode(course.id)
+      %>
+      ## Only display the return link for MiMos or Exams
+      % if course_id.startswith('ref/m') or course_id.startswith('ref/e'):
+        <li class="back-to-track">
+          <a href="${marketing_link('ROOT')}/return/${course.id}">
+            <i class="fa fa-long-arrow-left"></i>
+            Revenir au cours
+          </a>
+        </li>
+      %endif
     </ol>
   </div>
 </nav>