You shouldn't see this in the view source of your page once you've made the change and refreshed the page:
<script type='text/javascript'>
/* <![CDATA[ */
var _wpcf7 = {"loaderUrl":"http:\/\/example.com\/wp-content\/plugins\/contact-form-7\/images\/ajax-loader.gif","sending":"Sending ...","cached":"1"};
/* ]]> */
</script>
<script type='text/javascript' src='http://example.com/wp-content/plugins/contact-form-7/includes/js/scripts.js?ver=3.5.2'></script>