This reverts commit 760a9be5.

private group and channel.  Check for illegal name for private group.

- Use il8n for error messages
- Add il8n english error message for duplicate channel/private group
  name
- Add illegal name serverside check to createPrivateGroup method
- Add logic to handle different error types on privateGroupsFlex page

Replace typing messages. Insert into data.Typing instead of data.Messages and use ReactiveVar to determine if current user is typing.

fixed side-nav UI; implemented settings template

Revert "Created and pushed by LingoHub. Project: 'Rocket.Chat' by User: 'marcelo.schmidt@konecty.com'."

This reverts commit 3236018d.