Basic support for Mosaico-based email templates.

client/src/lib/mosaico-sandbox-root.js

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+'use strict';
+
+import React from 'react';
+import ReactDOM from 'react-dom';
+import {
+    I18nextProvider,
+} from 'react-i18next';
+import i18n from './i18n';
+import styles from "./mosaico.scss";
+import { MosaicoSandbox } from './mosaico';
+import { UntrustedContentRoot } from './untrusted';
+
+export default function() {
+    ReactDOM.render(
+        <I18nextProvider i18n={ i18n }>
+            <UntrustedContentRoot render={props => <MosaicoSandbox {...props} />} />
+        </I18nextProvider>,
+        document.getElementById('root')
+    );
+};
+
+