Add localizations from the get go

- Add an example string for Hello World
- put strings in locales/en.json
- add 

```
  plugins: [
    new CopyWebpackPlugin({
      patterns: [
...
        { from: 'public/locales/', to: './locales/' }, // Copy all locales to the output folder
      ],
    }),
```

to `webpack.config.js`