Script to generate the translations base file

Also replaces the translations base file with the output of the
script.

package.json

@@ -101,7 +101,9 @@
     "eslint-plugin-babel": "^4.0.1",
     "eslint-plugin-flowtype": "^2.30.0",
     "eslint-plugin-react": "^7.4.0",
+    "estree-walker": "^0.5.0",
     "expect": "^1.16.0",
+    "flow-parser": "^0.57.3",
     "json-loader": "^0.5.3",
     "karma": "^1.7.0",
     "karma-chrome-launcher": "^0.2.3",
@@ -121,6 +123,7 @@
     "rimraf": "^2.4.3",
     "sinon": "^1.17.3",
     "source-map-loader": "^0.1.5",
+    "walk": "^2.3.9",
     "webpack": "^1.12.14"
   }
 }