fix(i18n): pathPrefix for languages at subpath

client/gatsby-config.js

@@ -1,6 +1,10 @@
 const path = require('path');
-const config = require('./config/env');
 
+const {
+  clientLocale,
+  curriculumLocale,
+  homeLocation
+} = require('../config/env');
 const {
   buildChallenges,
   replaceChallengeNode,
@@ -8,12 +12,17 @@ const {
 } = require('./utils/buildChallenges');
 
 const curriculumIntroRoot = path.resolve(__dirname, './src/pages');
+const pathPrefix =
+  clientLocale === 'english' || clientLocale === 'chinese'
+    ? ''
+    : '/' + clientLocale;
 
 module.exports = {
   siteMetadata: {
     title: 'freeCodeCamp',
-    siteUrl: config.homeLocation
+    siteUrl: homeLocation
   },
+  pathPrefix: pathPrefix,
   plugins: [
     'gatsby-plugin-react-helmet',
     'gatsby-plugin-postcss',
@@ -34,7 +43,7 @@ module.exports = {
       options: {
         name: 'challenges',
         source: buildChallenges,
-        onSourceChange: replaceChallengeNode(config.curriculumLocale),
+        onSourceChange: replaceChallengeNode(curriculumLocale),
         curriculumPath: localeChallengesRootDir
       }
     },

client/package.json

@@ -85,7 +85,7 @@
   "license": "MIT",
   "scripts": {
     "prebuild": "echo 'Client workers building...' && npm run build:workers && echo 'Client workers ready.' && node ../tools/scripts/build/ensure-env.js",
-    "build": "node --max_old_space_size=7168 node_modules/gatsby-cli build",
+    "build": "node --max_old_space_size=7168 node_modules/gatsby-cli build --prefix-paths",
     "build:workers": "node --max_old_space_size=7168 node_modules/webpack-cli --env.production --config ./webpack-workers.js && echo",
     "build:workers:debug": "node --max_old_space_size=7168 node_modules/webpack-cli --env.production --config ./webpack-workers.js --progress",
     "clean": "gatsby clean",