Change class on 'error' edits so they don't get the @negative-text color from release-editor.less.
Ensure edit-error is used on the listing too; improve generated whitespace.
Merge branch 'fix-edit-error-h1' into beta

* fix-edit-error-h1:
  Ensure edit-error is used on the listing too; improve generated whitespace.
  Change class on 'error' edits so they don't get the @negative-text color from release-editor.less.