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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.
Writing it here is useless.
The first point is already here: https://github.com/codewars/codewars.com/issues/1398
For the other one, one can only hope, or you can translate some katas to Perl (or create new ones).