fix locale 404 not default

public/js/index_bundle.js

@@ -62215,7 +62215,8 @@ var Root = function (_React$Component) {
         value: function componentDidMount() {
             var _this2 = this;
 
-            var lang = navigator.language.substring(0, 2);
+            var slang = sessionStorage.getItem('lang');
+            var lang = slang || navigator.language.substring(0, 2);
             fetch('/locales/' + lang + '.json').then(function (response) {
                 if (response.status == 200) return response.json();
                 return {};