Merge pull request #3553 from edx/sylvia/docs/DOC-294

Update LTI settings information
add quotation mark to _dashboard_course_listing.html
Merge pull request #3620 from edx/adam-add-quotation-mark

Adam add quotation mark
Changes for Help Modal to work on Stanford Site

- moved zendesk endpoint to new condition
- some help modal styling
Field name is 'username' not 'user'
auto-create OAuth token for Github API
memoized function
Removed message about non-affiliated open source contributors
Merge pull request #3618 from edx/ned/remove-press-stories

Remove press-page machinery and assets
Show same thing on dash for audit and honor code students.
Merge pull request #3627 from edx/diana/fix-audit-cert

Fix audit certificate display
IGNORABLE_404_ENDS is wrong and unused

This setting is only used if SEND_BROKEN_LINK_EMAILS is true, which it
is not, and it is deprecated, and this value for it is wrong, since it
is used as an iterable.
Fix dashboard template around final grade status

* ae8847cd6e73 checked in buggy conditional in the dashboard templates
  that caused an empty 'details being wrapped up' box to display
  regardless of whether it was true.
* Simplify conditional so that we care only whether output of the view's
  _cert_info() says 'processing', which should be the value computed when
  either no cert status exists or when the certs are, in fact processing.

  This should mean that the "details being wrapped up" message is
  displayed when certs haven't run and the grade box is displayed the
  rest of the time.
Convert lettuce video tests specifically using youtube stub
Merge pull request #3492 from edx/ammar/bok-choy-youtube-stub-video-tests

Convert lettuce video tests specifically using youtube stub
Fixed cheatsheet for open ended editor.
STUD-1583
Merge pull request #3510 from edx/waheed/stud1583-toggle-cheatsheet-not-working

Fixed cheatsheet for open ended editor.
Merge pull request #3608 from edx/anton/i18n-code-response

CodeResponse i18n.
Merge pull request #3586 from edx/anton/i18n-custom-response

CustomResponse i18n.
Describe date format for close/reopen discussions