Move js import into courseware js group.

lms/envs/common.py

@@ -830,6 +830,7 @@ courseware_js = (
         'coffee/src/' + pth + '.js'
         for pth in ['courseware', 'histogram', 'navigation', 'time']
     ] +
+    ['js/' + pth + '.js' for pth in ['ajax-error']] +
     sorted(rooted_glob(PROJECT_ROOT / 'static', 'coffee/src/modules/**/*.js'))
 )
 

lms/static/js/ajax-error.js

 $(document).ajaxError(function (event, jXHR) {
     if (jXHR.status === 401) {
-        alert(gettext('You\'re logged out. Redirecting on login page.'));
+        alert(gettext("You're logged out. Redirecting on login page."));
         window.location.href = '/accounts/login?next=' + window.location.href;
     }
 });

lms/templates/courseware/courseware.html

@@ -49,8 +49,6 @@ ${page_title_breadcrumbs(course_name())}
   ## codemirror
   <script type="text/javascript" src="${static.url('js/vendor/codemirror-compressed.js')}"></script>
 
-  <script type="text/javascript" src="${static.url('js/ajax-error.js')}"></script>
-
   <%static:js group='courseware'/>
   <%static:js group='discussion'/>