Split branch settings LMS-11056
Split branch settings code review fixes LMS-11056
Merge pull request #4532 from edx/split/branch-settings

Split/branch settings LMS-11056
BLD-1110: Create, edit, delete groups.
Add correct_or_past_due option for showanswer and update relevant documentation
Add Martin Segado to authors file
Merge pull request #4480 from edx/anton/create-edit-delete-groups

Group Configuration: create, edit, delete groups
Add support for theme translations and LANGUAGE_DICT override
Improvements to clicking and synchronization in Studio bok-choy tests.
Merge pull request #4209 from msegado/showanswer-correct-or-past-due

Add "Correct or Past Due" option for showanswer
Merge pull request #4533 from Stanford-Online/kluo/i18n-support-theme

Add support for theme translations and LANGUAGE_DICT override
Merge pull request #4465 from edx/zoldak/fix-studio-clicks

Improve clicking and synchronization in Studio bok-choy tests
Unit test for import performance STUD-1994
Address review comments.