* locale: added hr and oc react-intl locale data
* adds Croatian locale data in mastodon.js
* adds Occitan locale data in mastodon.js
Resolves#2667
* locale: sort locale data imports in mastodon.js
* locale: remove oc reference
* [react-intl](https://github.com/yahoo/react-intl) does not provide
default locale data for Occitan. Hence removed from reference.