[Glitch] Add confirmation modal when logging out from the web app

Port fd3d45d38f to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

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

@@ -1,6 +1,13 @@
 import { openModal } from 'flavours/glitch/actions/modal';
 import { connect }   from 'react-redux';
+import { defineMessages, injectIntl } from 'react-intl';
 import Header from '../components/header';
+import { logOut } from 'flavours/glitch/util/log_out';
+
+const messages = defineMessages({
+  logoutMessage: { id: 'confirmations.logout.message', defaultMessage: 'Are you sure you want to log out?' },
+  logoutConfirm: { id: 'confirmations.logout.confirm', defaultMessage: 'Log out' },
+});
 
 const mapStateToProps = state => {
   return {
@@ -16,6 +23,13 @@ const mapDispatchToProps = (dispatch, { intl }) => ({
     e.stopPropagation();
     dispatch(openModal('SETTINGS', {}));
   },
+  onLogout () {
+    dispatch(openModal('CONFIRM', {
+      message: intl.formatMessage(messages.logoutMessage),
+      confirm: intl.formatMessage(messages.logoutConfirm),
+      onConfirm: () => logOut(),
+    }));
+  },
 });
 
-export default connect(mapStateToProps, mapDispatchToProps)(Header);
+export default injectIntl(connect(mapStateToProps, mapDispatchToProps)(Header));