As a general rule, links to other sites that form a part of the problem specification should be avoided - you have no control over whether that content will continue to exist tomorrow, next week, or next year, etc. If it disappears, it will be difficult to see what the Kata is asking for. Less important, I personally find it frustrating to have to look up relevant content in another page - the description should contain everything needed to actually solve the problem.

Suggest copying the image into the Kata description, or giving a (more permanent) text description of the mapping.

I enjoyed this kata. However the description says nothing about ordering the output list (or possible duplicates in it). That's ok in Python since tests compare sets, but in JS the list has to be sorted alphabetically to be valid (and, I guess though I did not check it, mustn't include duplicates). This should be clearly stated in the description, and preferentially should the requirements of distinct languages be uniformized.