Add translation babel plugins and module to generate json strings file

lib/server/find-strings-plugin.js

@@ -0,0 +1,45 @@
+/**
+ * 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.
+ */
+
+/* find all strings with their descriptions that need to be translated and write
+   to i18n/en.json file */
+
+const fs = require("fs");
+
+module.exports = function findStringsPlugin(babel) {
+  const { types: t } = babel;
+
+  const translationsFile = process.cwd() + "/i18n/en.json";
+  let currentTranslations = JSON.parse(
+    fs.readFileSync(translationsFile, "utf8")
+  );
+
+  return {
+    visitor: {
+      JSXElement(path) {
+        if (path.node.openingElement.name.name !== "Translate") {
+          return;
+        }
+        const text = path.node.children[0].value.trim();
+        let description;
+        const attributes = path.node.openingElement.attributes;
+        for (let i = 0; i < attributes.length; i++) {
+          if (attributes[i].name.name === "desc") {
+            description = attributes[i].value.value;
+          }
+        }
+        if (!currentTranslations["pages-strings"]) {
+          currentTranslations["pages-strings"] = {};
+        }
+        currentTranslations["pages-strings"][text + "|" + description] = text;
+        fs.writeFileSync(translationsFile, JSON.stringify(currentTranslations));
+      }
+    }
+  };
+};