message: Add i18n script to package.json
diff: "scripts": {
  "reskindex": "node scripts/reskindex.js -h header",
  "reskindex:watch": "node scripts/reskindex.js -h header -w",
  + "i18n": "node scripts/gen-i18n.js",
  "build": "npm run reskindex && babel src -d lib --source-maps --copy-files",
  "build:watch": "babel src -w -d lib --source-maps --copy-files",
  "emoji-data-strip": "node scripts/emoji-data-strip.js",
  