"no" is an abbreviation for "number" and "č" is the correct translation for that interpretation: https://en.wiktionary.org/wiki/%C4%8D%2E (though Wiktionary only has Czech)

Sure sure, it literally doesn't happen with any other language I know of though

And it clearly isn't the translation anyone in the world would expect

Shouldn't it be a "no.", with a period at the end?

Anyway, the translation is wrong given the context as no numeral follows.