feat(i18n): add env ANSWER_I18N_ROOT for secondary development

Author: liruohrh

ui/config-overrides.js

@@ -26,7 +26,12 @@ const {
 const webpack = require('webpack');
 
 const path = require("path");
-const i18nPath = path.resolve(__dirname, "../i18n");
+
+let i18nRoot = "../i18n";
+if(process.env.ANSWER_I18N_ROOT){
+  i18nRoot = process.env.ANSWER_I18N_ROOT;
+}
+const i18nPath = path.resolve(__dirname, i18nRoot);
 
 module.exports = {
   webpack: function(config, env) {