Locale prop not used

Expected behavior

I would like to use locale prop in my DatePicker, just like in the example:

        <DatePicker
          selected={this.state.startDate}
          onChange={this.handleChange}
          locale="fr"
          todayButton={"Aujourd'hui"}
        />

But, it seems to not work because it is still in English. My dependencies are:

    "moment": "2.21.0",
    "react": "16.2.0",
    "react-dom": "16.2.0",
    "react-datepicker": "1.2.2"

Steps to reproduce

I created a simple example in this CodeSandBox: https://codesandbox.io/s/5383o29jpx.

[indapublic]

Fixed by importing moment locale

import moment from 'moment'
import 'moment/locale/ru'
moment.locale('ru')

[kkras3]

Now wait… I simply set moment locale moment.locale('fr') and in the datepicker

<Datepicker
    locale={'fr'} 
        ... 
/>

and it just works. No need to import the locale resources.