feat(i18n): added i18next for user interface translations (#432)

package.json

@@ -71,6 +71,7 @@
     "github-markdown-css": "3.0.1",
     "html-webpack-plugin": "3.2.0",
     "husky": "3.1.0",
+    "i18next": "19.1.0",
     "identity-obj-proxy": "3.0.0",
     "in-publish": "2.0.0",
     "jest": "24.9.0",
@@ -99,6 +100,7 @@
     "react-dom": "16.13.0",
     "react-hook-form": "3.29.4",
     "react-hot-loader": "4.12.18",
+    "react-i18next": "11.3.1",
     "react-router-dom": "5.1.2",
     "request": "2.88.0",
     "resolve-url-loader": "3.1.1",
@@ -138,7 +140,7 @@
   "bundlesize": [
     {
       "path": "./static/vendors.*.js",
-      "maxSize": "185 kB"
+      "maxSize": "200 kB"
     },
     {
       "path": "./static/main.*.js",