Возвращаем на место иконки удаления дисциплины

~dev_rating/media/less/teacher/index.css

@@ -75,7 +75,7 @@
 button.DeleteDiscipline {
   height: 27px;
   width: 27px;
-  background: url("../imgicons/del_dis.png") no-repeat center center;
+  background: url("../../img/icons/del_dis.png") no-repeat center center;
   border: 0;
   cursor: pointer;
 }

~dev_rating/media/less/teacher/index.less

 @import (reference) "../common.less";
+@ImagePath: '../../img/';
 
 .info_cell, .action_cell, .delete_cell
 {