ensure to load bootstrap from CDN

lib/views/layout/layout.html

@@ -27,9 +27,8 @@
       headElement.appendChild(scriptElement);
     }
   </script>
-
-  <!-- jQuery, emojione -->
-  <script src="https://cdn.jsdelivr.net/combine/npm/emojione@3.1.2,npm/jquery@3.3.1"></script>
+  <!-- jQuery, emojione, bootstrap -->
+  <script src="https://cdn.jsdelivr.net/combine/npm/emojione@3.1.2,npm/jquery@3.3.1,npm/bootstrap@3.3.7/dist/js/bootstrap.min.js"></script>
   <!-- highlight.js -->
   <script src="https://cdn.jsdelivr.net/gh/highlightjs/cdn-release@9.12.0/build/highlight.min.js"></script>
   <script src="https://cdn.jsdelivr.net/combine/

resource/js/legacy/crowi-form.js

@@ -2,7 +2,6 @@ var pageId = $('#content-main').data('page-id');
 var pagePath= $('#content-main').data('path');
 
 require('bootstrap-select');
-require('bootstrap-sass');
 
 // show/hide
 function FetchPagesUpdatePostAndInsert(path) {

resource/js/legacy/crowi.js

@@ -16,7 +16,6 @@ import Page from '../components/Page';
 const io = require('socket.io-client');
 const entities = require('entities');
 const escapeStringRegexp = require('escape-string-regexp');
-require('bootstrap-sass');
 require('jquery.cookie');
 
 require('./thirdparty-js/agile-admin');