Add spinner to publisher when posting a message
Fixes #4949
Add error flash message to publisher on error from server
Refactor UI hint on status message submit.
Now we close the publisher on submit and reopen it on error. The spinner is shown while submission is in progress. Fixes #4949
Make publisher spinner also work in bootstrap publisher
Make sure publisher is totally hidden in bookmarklet after post success
Remove double setButtonsEnabled in publisher error
Remove custom bookmarklet error message.
Flash error is shown on bookmarklet post error. On error, return post_something message to form
Merge pull request #4976 from jaywink/4949-post-submit-actions

Hint that something is happening when user submits status message via publisher