studio - revised course nav: fixed placeholder login link text

cms/templates/widgets/header.html

@@ -85,7 +85,7 @@
       <h2 class="sr">You're not currently logged in</h2>
       <ol>
         <li>
-          <a class="action action-login" href="${reverse('login')}">Logout</a>
+          <a class="action action-login" href="${reverse('login')}">Login</a>
         </li>
       </ol>
     </nav>