Merge pull request openedx#1107 from edx/mikix/i18n-tools

Bump edx-i18n-tools version

Merge pull request openedx#1104 from edx/bfiller/release-2.1.15

bump release version to 2.1.15

Fix issue with linkifying submissions https://openedx.atlassian.net/b…

…rowse/EDUCATOR-2634

Add support for wysiwyg prompt editing and update css

Merge pull request openedx#1095 from edx/bfiller/rebuild-assets

update css

Merge pull request openedx#1092 from edx/nedbat/explicit-packages

Don't install anything but openassessment

Merge pull request openedx#1076 from edx/2.1.11_update_js

2.1.11 update js

Merge pull request openedx#1073 from edx/efischer/group_access_export

Efischer/group access export

Merge pull request openedx#1066 from edx/aed/EDUCATOR-1817

Fix typos and poor code issues from previous commit