Merge pull request #2754 from edx/dcs/a11y-shorter-titles

Display only the first component name in the page (and nav) title.

common/lib/xmodule/xmodule/seq_module.py

@@ -88,20 +88,20 @@ class SequenceModule(SequenceFields, XModule):
             rendered_child = child.render('student_view', context)
             fragment.add_frag_resources(rendered_child)
 
+            for grand_child in child.get_children():
+                title = grand_child.display_name
+                if title:
+                    break
+            else:
+                title = child.display_name_with_default
             childinfo = {
                 'content': rendered_child.content,
-                'title': "\n".join(
-                    grand_child.display_name
-                    for grand_child in child.get_children()
-                    if grand_child.display_name is not None
-                ),
+                'title': title,
                 'progress_status': Progress.to_js_status_str(progress),
                 'progress_detail': Progress.to_js_detail_str(progress),
                 'type': child.get_icon_class(),
                 'id': child.id,
             }
-            if childinfo['title'] == '':
-                childinfo['title'] = child.display_name_with_default
             contents.append(childinfo)
 
         params = {'items': contents,