I think you did the same mistake as I have (as I got exactly the same failed test)
The problem was, that I was always looking for odd number in the list (which was super easy)
The real task is bit more complicated, so make sure you read the description carefuly.

The '3 pigs' multiline test has stumped me. My code is returning the modified string correctly with no extra spaces upon each new line, however the test case still says there is an error. It's difficult to debug without more information as to what that error is (ie: an extra space somewhere or perhaps something else which is not detectable with the test case output.)

Translated into both Ruby and Python: thank you for your interesting work again, senpai :)

How should I differentiate a singular word ending in 's' from a plural word: like "ananas" and "bananas". Tips plesase :D

Start by searching about currying in javascript.
It's not quite what the kata asks for, but add a little recursion and you will find the answer.

You will also need to know how to make a function which can also be used as a value.

Which language?

I think it's ZozoFouchtra's signature (he's the author of the JS translation).

I don't mean to be rude, but this Kata didn't really give me any new perspectives on problem solving. I think it could be more useful if it had a better description.