[Glitch] Add lang attribute to compose textarea and CW field

Port 83a8efa9ca to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

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

@@ -70,6 +70,7 @@ function mapStateToProps (state) {
     mediaDescriptionConfirmation: state.getIn(['local_settings', 'confirm_missing_media_description']),
     preselectOnReply: state.getIn(['local_settings', 'preselect_on_reply']),
     isInReply: state.getIn(['compose', 'in_reply_to']) !== null,
+    lang: state.getIn(['compose', 'language']),
   };
 };