New pre-requisite course feature via milestones app

common/lib/xmodule/xmodule/course_module.py

@@ -184,6 +184,11 @@ class CourseFields(object):
         help=_("Enter the date you want to advertise as the course start date, if this date is different from the set start date. To advertise the set start date, enter null."),
         scope=Scope.settings
     )
+    pre_requisite_courses = List(
+        display_name=_("Pre-Requisite Courses"),
+        help=_("Pre-Requisite Course key if this course has a pre-requisite course"),
+        scope=Scope.settings
+    )
     grading_policy = Dict(
         help="Grading policy definition for this class",
         default={

common/lib/xmodule/xmodule/templates/about/overview.yaml

@@ -11,8 +11,8 @@ data: |
     </section>
 
     <section class="prerequisites">
-      <h2>Prerequisites</h2>
-      <p>Add information about course prerequisites here.</p>
+      <h2>Requirements</h2>
+      <p>Add information about the skills and knowledge students need to take this course.</p>
     </section>
 
     <section class="course-staff">