Spanish translation missing images

[papagala]

Summary

When changing the language to Spanish, I cannot see at least a couple of images and the exercises are then impossible to solve since they are referring to it

System information

Please specify the KA Lite version you were using and your operating system!

• Operating system: Windows 7
• Version: KA Lite version 0.17.5 © 2019
• Browser: Chrome and Explorer

Traceback or relevant snippet from server.log

INSERT TRACEBACK, LOG MESSAGES ETC. HERE

How to reproduce

1. Start the server and install Spanish package
2. This URL works if the user chose English, and the same url does not work if the user is in Spanish.

http://127.0.0.1:8008/learn/khan/economics-finance-domain/core-finance/accounting-and-financial-stateme/financial-statements-tutorial/interpreting-the-balance-sheet/

Screenshots

Error:

404 Not Found
The path '/content/assessment/khan/52e/52e370338c05829d0f6ab00fa5c160f2d936ed3e.jpg' was not found.

Traceback (most recent call last):
File "C:\Python27\lib\site-packages\kalite\packages\dist\cherrypy_cprequest.py", line 670, in respond
response.body = self.handler()
File "C:\Python27\lib\site-packages\kalite\packages\dist\cherrypy\lib\encoding.py", line 212, in call
self.body = self.oldhandler(*args, **kwargs)
File "C:\Python27\lib\site-packages\kalite\packages\dist\cherrypy_cpdispatch.py", line 61, in call
return self.callable(*self.args, **self.kwargs)
File "C:\Python27\lib\site-packages\kalite\packages\dist\cherrypy_cptools.py", line 177, in handle_func
raise cherrypy.NotFound()
NotFound: (404, "The path '/content/assessment/khan/52e/52e370338c05829d0f6ab00fa5c160f2d936ed3e.jpg' was not found.")
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Real-life consequences (anything community should be aware, for instance how it affects your deployment)

If applicable