Let people know courses are free. <sigh>

lms/templates/courses.html

@@ -11,7 +11,7 @@
         <div class="logo">
           <img src="${static.url('images/edx_bw.png')}" />
         </div>
-        <h2>Explore courses from leading universities.</h2>
+        <h2>Explore free courses from leading universities.</h2>
       </hgroup>
     </div>
   </header>

lms/templates/index.html

@@ -45,7 +45,7 @@
 
   <section class="container">
     <section class="highlighted-courses">
-      <h2>Explore courses from <span class="edx">edX</span> universities</h2>
+      <h2>Explore free courses from <span class="edx">edX</span> universities</h2>
 
       <section class="university-partners">
         <ol class="partners">