The file lms/templates/problem.html changed between Ficus and Ginkgo.
Some strings were added to the file, but they do not end up in any of the po files for Ginkgo.
For example, on line 122
notification_message=_('Answers are displayed within the problem'),
does not get translated because the string did not made it into Transifex.
I added a new translation locally at the end of django.po and I was able to see the translation after recompiling messages and assets.
Create a problem. Use another language than English.
"Answers are displayed within the problem" will display in English.