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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Try reading this, see if it helps.
The only language he has trained is javascript and afaik both the tests and the description is fine.
This kata was published in 2013. Back then, standards were much more lax. Now the standards are much higher.
I do not say the kata does not need to be fixed, but it is broken... how exactly? What language version? What is wrong with it? If you want to have it fixed, it would be good to at least say what you want to have fixed.