changed interstitial text between peer gradings from 'fetched' to 'fetching'
changing message that shows when users go forward and back from openended and fix save reload message
change label from "check" to "submit"
refine "save" message capa

Per @jinpa:
> Looking again now at the wording in 6eb78cc I'm worried that "saved
> by not graded" doesn't make crystal clear that they haven't been
> _submitted_.  Given that we're not auto-submitting at the deadline
> (someday let's add that feature), can we change the wording to:
> "Your answers have been saved but not submitted. Click 'Submit'
> when you're ready."
capa: submit/final submit button naming

We have found that users were getting confued by the buttons named
"check," and on their last allowed attempt, "final check."  Check looks
implies something for the user only, not a real problem submission.

So this changes the wording to "Submit" for most attempts, and "Final
Submit" for the last attempt allowed.

We (Stanford) had made a prior change to only say "Submit" on the final
attempt, but condisering that now that seems even more confusing.
Merge branch 'giulio/peer-grading-style-release' of github.com:edx/edx-platform into edx-west/release-candidate-20130806

Conflicts:
	common/lib/capa/capa/templates/choicegroup.html
Merge branch 'jinpa/check-off-edx-west-release' of github.com:edx/edx-platform into edx-west/release-candidate-20130806