Work around elastic#11959 for now (elastic#12051)

* Fix use of KuiButtons in Clone Modal.

* [scripts] stub scripts/languages api until elastic#11959 is fixed

src/core_plugins/kibana/public/dashboard/top_nav/clone_modal.js

@@ -65,14 +65,14 @@ export class DashboardCloneModal extends React.Component {
 
           <KuiModalFooter>
             <KuiButton
-              type="hollow"
+              buttonType="hollow"
               data-test-subj="cloneCancelButton"
               onClick={ this.props.onClose }
             >
               Cancel
             </KuiButton>
             <KuiButton
-              type="primary"
+              buttonType="primary"
               data-test-subj="cloneConfirmButton"
               onClick={ this.cloneDashboard }
             >

src/core_plugins/kibana/server/routes/api/scripts/register_languages.js

@@ -1,27 +1,9 @@
-import _ from 'lodash';
-import handleESError from '../../../lib/handle_es_error';
-
 export function registerLanguages(server) {
   server.route({
     path: '/api/kibana/scripts/languages',
     method: 'GET',
     handler: function (request, reply) {
-      const { callWithRequest } = server.plugins.elasticsearch.getCluster('data');
-
-      return callWithRequest(request, 'cluster.getSettings', {
-        include_defaults: true,
-        filter_path: '**.script.engine.*.inline'
-      })
-      .then((esResponse) => {
-        const langs = _.get(esResponse, 'defaults.script.engine', {});
-        const inlineLangs = _.pick(langs, (lang) => lang.inline === 'true');
-        const supportedLangs = _.omit(inlineLangs, 'mustache');
-        return _.keys(supportedLangs);
-      })
-      .then(reply)
-      .catch((error) => {
-        reply(handleESError(error));
-      });
+      reply(['painless', 'expression']);
     }
   });
 }