https://github.com/edx-solutions/xblock-drag-and-drop-v2/pull/48.

While working on getting the Drag and Drop v2 XBlock ready for edx.org,
we discovered a bug in xblock-utils that kept resources containing
non-ASCII chars from being loaded correctly. This bug was fixed in
https://github.com/edx/xblock-utils/pull/36, and the fix was integrated
into edx-platform via
https://github.com/edx/edx-platform/pull/11282 (target branch: named-release/dogwood.rc) and
https://github.com/edx/edx-platform/pull/11283 (target branch: master).