Integrate handling of translation tag into static html building, add default description to translate tags

lib/server/translate.js

@@ -0,0 +1,25 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+const siteConfig = require(CWD + "/siteConfig.js");
+
+let language = "en";
+
+function setLanguage(lang) {
+  language = lang;
+}
+
+function translate(str) {
+  return siteConfig[language]["pages-strings"][str];
+}
+
+module.exports = {
+  setLanguage: setLanguage,
+  translate: translate
+};