Consolidate information from data.edx.org, Appendix E, and problem types
Improve dump_course_ids test for unicode course_ids
Merge pull request #2944 from rocha/improve-dumps-course-ids-tests

Improve dump_course_ids test for unicode course_ids
Merge pull request #2943 from edx/sylvia/documentation/BLD-850

Consolidate information from data.edx.org, Appendix E, and problem types
Edits from Alison's initial review

DOC-34
Merge pull request #2947 from edx/markhoeber/documentation/doc-34

Edits from Alison's initial review
Update translations (autogenerated message)
Merge pull request #2951 from edx/sarina/031514-language-update

Update translations (autogenerated message)
Internationalization fixed for error msg on staff grading page.
LMS-2195
Merge pull request #2926 from edx/waheed/lms2195-localization-fix-on-staff-grading-page

Internationalization fixed for error msg on staff grading page.