C#: method name should be PascalCase (Please refer to implementation of backward compatibility here )

Insufficient random tests in possibly all languages

• JS Node 18. (mocha + chai) should be enabled

• Python new test framework should be used (Refer this & this for more detail)

• Ruby 3.0 should be enabled (Refer this & this for more detail)

Sentences like "José is a garçon at a café in the cañón." are tested, with non English letters, which absolutely contradicts the description. Diacritic variants of consonants are possibly hundreds in Human languages, this point needs to be clarified imperatively, or it sounds just like this kata merely aims to fool users.

Test.assert_equals should be used instead.

You can replace

test.expect(a == x, 'Expected %s but got %s' % (x,a))    

with

test.assert_equals(a, x)

It reads better (which is especially important for Example Test Cases) and does almost the same thing.