<link href="path/to/grapes.min.css" rel="stylesheet"/>
<link href="path/to/grapesjs-preset-ostendis.css" rel="stylesheet"/>

<script src="path/to/grapes.min.js"></script>
<script src="path/to/grapesjs-preset-ostendis.min.js"></script>

<div id="gjs"></div>
<script type="text/javascript">
  var editor = grapesjs.init({
      container : '#gjs',
      plugins: ['gjs-preset-ostendis'],
      pluginsOpts: {
        'gjs-preset-ostendis': {
          modalTitleImport: 'Import template',
          // ... other options
        }
      }
  });
</script>