SAM-1709 make the message about posting to server more prominent


git-svn-id: https://source.sakaiproject.org/svn/sam/trunk@307255 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAM-2166: Improvements to downloading file submissions in SAMigo

git-svn-id: https://source.sakaiproject.org/svn/sam/trunk@307256 66ffb92e-73f9-0310-93c1-f5514f145a0a