Fix media description confirmation modal

Fixes #1040

app/javascript/flavours/glitch/features/compose/containers/compose_form_container.js

@@ -1,5 +1,5 @@
 import { connect } from 'react-redux';
-import { defineMessages } from 'react-intl';
+import { defineMessages, injectIntl } from 'react-intl';
 import ComposeForm from '../components/compose_form';
 import {
   changeCompose,
@@ -133,4 +133,4 @@ const mapDispatchToProps = (dispatch, { intl }) => ({
 
 });
 
-export default connect(mapStateToProps, mapDispatchToProps)(ComposeForm);
+export default injectIntl(connect(mapStateToProps, mapDispatchToProps)(ComposeForm));