adding _blank on links of aditional material, #107

Author: moacirmoda

themes/default/templates/administration/course-material-admin.html

@@ -91,7 +91,7 @@ <h1>{% trans "Course Material" %}</h1>
                     <li><h5>{% trans "Files" %}</h5></li>
                     <li ng-repeat="file_obj in course_material.files">
                         {% verbatim %}
-                        <a ng-href="{{ file_obj.file }}">{{file_obj.file|filename}}</a> <button type="submit" ng-click="delete_file(file_obj)" class="btn btn-xs btn-warning pull-right"><i class="fa fa-trash-o"></i></button>
+                        <a ng-href="{{ file_obj.file }}" target="_blank">{{file_obj.file|filename}}</a> <button type="submit" ng-click="delete_file(file_obj)" class="btn btn-xs btn-warning pull-right"><i class="fa fa-trash-o"></i></button>
                         {% endverbatim %}
                     </li>
                 </ul>