fix for #8768

Gruntfile.js

@@ -145,7 +145,6 @@ module.exports = function(grunt) {
   grunt.loadNpmTasks('grunt-recess');
   grunt.loadNpmTasks('browserstack-runner');
 
-
   // Docs HTML validation task
   grunt.registerTask('validate-docs', ['jekyll', 'validation']);
 

dist/js/bootstrap.js

@@ -1064,7 +1064,7 @@ if (!jQuery) { throw new Error("Bootstrap requires jQuery") }
   })
 
   $(document)
-    .on('shown.bs.modal',  '.modal', function () { $(document.body).addClass('modal-open') })
+    .on('show.bs.modal',  '.modal', function () { $(document.body).addClass('modal-open') })
     .on('hidden.bs.modal', '.modal', function () { $(document.body).removeClass('modal-open') })
 
 }(window.jQuery);

js/modal.js

@@ -238,7 +238,7 @@
   })
 
   $(document)
-    .on('shown.bs.modal',  '.modal', function () { $(document.body).addClass('modal-open') })
+    .on('show.bs.modal',  '.modal', function () { $(document.body).addClass('modal-open') })
     .on('hidden.bs.modal', '.modal', function () { $(document.body).removeClass('modal-open') })
 
 }(window.jQuery);