This commit achieves two things:
  1. Changes the UI of the "Create stream" form to make the
     textarea previously used to get the stream description
     a simple input field of type text (to suggest a single
     line description).
  2. Adds an extra check on the frontend side to make sure that
     when users create a new stream via. the "Create stream"
     option in the settings panel, they can't enter any newline
     characters (i.e. we disallow the enter key from being
     registered when typing out the stream description).
     We must also make sure that they cannot copy-and-paste over
     descriptions containing newline characters.
  resolves #11617
		
	
Zulip overview
Zulip is a powerful, open source group chat application that combines the immediacy of real-time chat with the productivity benefits of threaded conversations. Zulip is used by open source projects, Fortune 500 companies, large standards bodies, and others who need a real-time chat system that allows users to easily process hundreds or thousands of messages a day. With over 300 contributors merging over 500 commits a month, Zulip is also the largest and fastest growing open source group chat project.
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