Revert "Make the JsonResponse explicitly utf-8"
Revert "Make the JsonResponse explicitly utf-8"

This reverts commit 4f1f514e5999d30fe54dc41e85d5f2372bb4262c.

Fix broken tests

Edraak/edx-platform,Edraak/edx-platform,Edraak/edx-platform,Edraak/edx-platform,Edraak/edx-platform