SAM-2292: Item Stem validation issues when using Rich text / Attachments format in Options

git-svn-id: https://source.sakaiproject.org/svn/sam/trunk@307636 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAM-2293: Labels / default text that differ from the spec

git-svn-id: https://source.sakaiproject.org/svn/sam/trunk@307637 66ffb92e-73f9-0310-93c1-f5514f145a0a