Add number property to CourseDescriptor and switch templates to use it.

common/lib/xmodule/xmodule/course_module.py

@@ -27,7 +27,7 @@ class CourseDescriptor(SequenceDescriptor):
         return self.metadata['display_name']
 
     @property
-    def course_number(self):
+    def number(self):
         return self.location.course
 
     @property

lms/templates/course.html

@@ -9,7 +9,7 @@
     <header class="course-preview">
         <a href="${reverse('about_course', args=[course.id])}">
         <hgroup>
-          <h2>${course.course_number} ${course.get_about_section('title')}</h2>
+          <h2>${course.number} ${course.get_about_section('title')}</h2>
         </hgroup>
         <div class="info-link">&#x2794;</div>
       </a>

lms/templates/portal/course_about.html

@@ -11,7 +11,7 @@
     <div class="intro-inner-wrapper">
       <section class="intro">
         <hgroup>
-        <h1>${course.get_about_section("title")}</h1><h2><a href="#">${course.get_about_section("university")}</a></h2>
+        <h1>${course.number}: ${course.get_about_section("title")}</h1><h2><a href="#">${course.get_about_section("university")}</a></h2>
         </hgroup>
 
         <div class="main-cta">