Including courseware context in _ template

lms/templates/discussion/_underscore_templates.html

@@ -13,6 +13,11 @@
             <div class="post-body">
                 ${'<%- body %>'}
             </div>
+            ${'<% if (courseware_location) { %>'}
+            <div class="post-context">
+                (this post is about <a href="../../jump_to/<% courseware_location %>"><% courseware_title %></a>)
+            </div>
+            ${'<% } %>'}
             <div class="post-status">
               ${'<% if (closed) { %>'}
                 This thread is closed.