add: get cookie lang

package.json

     "antd": "^3.6.6",
     "axios": "^0.18.0",
     "dayjs": "^1.7.2",
+    "js-cookie": "^2.2.0",
     "prop-types": "^15.6.2",
     "react": "^16.4.1",
     "react-dom": "^16.4.1",

src/App.js

 import PropTypes from "prop-types";
 import { message } from "antd";
 import axios from "axios";
+import Cookies from "js-cookie";
 import intl from "react-intl-universal";
 import { ERROR_DEFAULT, LIMIT, COMMENT_TYPE, LANGUAGE_LINK } from "./constant";
 import { CommentContext } from "./Comment";
    */
   loadLocales() {
     let { locales: currentLocale } = this.props;
+    const cookieLang = Cookies.get("lnk_lang");
     if (!currentLocale) {
-      currentLocale = intl.determineLocale({
-        urlLocaleKey: "lang"
-      });
+      currentLocale =
+        cookieLang ||
+        intl.determineLocale({
+          urlLocaleKey: "lang"
+        });
     }
     currentLocale = SUPPORT_LOCALES.find(item => item.value === currentLocale)
       ? currentLocale