Only load Intl data for current language (#3130)

* Only load Intl data for current language

* Extract common chunk only from application.js and public.js

* Generate locale packs, avoid caching on window object

package.json

@@ -58,6 +58,7 @@
     "is-nan": "^1.2.1",
     "js-yaml": "^3.8.3",
     "lodash": "^4.17.4",
+    "mkdirp": "^0.5.1",
     "node-sass": "^4.5.2",
     "npmlog": "^4.0.2",
     "object-assign": "^4.1.1",
@@ -91,6 +92,7 @@
     "redux-immutable": "^3.1.0",
     "redux-thunk": "^2.2.0",
     "reselect": "^2.5.4",
+    "rimraf": "^2.6.1",
     "sass-loader": "^6.0.3",
     "stringz": "^0.1.2",
     "style-loader": "^0.16.1",