Adding French locale to mastodon.jsx

app/assets/javascripts/components/containers/mastodon.jsx

@@ -38,6 +38,7 @@ import { IntlProvider, addLocaleData } from 'react-intl';
 import en from 'react-intl/locale-data/en';
 import de from 'react-intl/locale-data/de';
 import es from 'react-intl/locale-data/es';
+import fr from 'react-intl/locale-data/fr';
 import getMessagesForLocale from '../locales';
 
 const store = configureStore();
@@ -46,7 +47,7 @@ const browserHistory = useRouterHistory(createBrowserHistory)({
   basename: '/web'
 });
 
-addLocaleData([...en, ...de, ...es]);
+addLocaleData([...en, ...de, ...es, ...fr]);
 
 const Mastodon = React.createClass({