Fixed delete modal not dismissed when clicking 'cancel' button.

admin_interface/static/admin/js/cancel.js

@@ -0,0 +1,16 @@
+(function($) {
+    'use strict';
+    $(function() {
+        $('.cancel-link').click(function(e) {
+            e.preventDefault();
+            var parentWindow = window.parent;
+            if (parentWindow && typeof(parentWindow.dismissRelatedObjectModal) === 'function') {
+                parentWindow.dismissRelatedObjectModal();
+            } else {
+                // fallback to default behavior
+                history.back();
+            }
+            return false;
+        });
+    });
+})(django.jQuery);