> "sign a piece of paper that was written in Mandarin" "Mandarin" is NOT a written language, but rather is a group of spoken dialects in Northern China [1]. The Chinese written language is called "hàn zì" [2]. [1] https://en.wikipedia.org/wiki/Mandarin_Chinese [2] https://en.wikipedia.org/wiki/Chinese_characters
Disclaimer. I neither speak nor write any form of Chinese, but I've read a bit on the subject. So: Cantonese (to choose one example) is a separate language from Mandarin (or a separate "variety", if you prefer [1]), but it uses the same writing system as Mandarin. Here is a random internet forum that supports the idea that two separate Chinese languages/varieties/dialects are using a single writing system: [2]. If th…
From friends, one tends to phrase things somewhat differently between the two languages/dialects. A phrase in one of them sometimes sounds awkward when expressed with the most directly equivalent words in the other.
So you've got some pretty good clues about whether the original author of a document was thinking in Mandarin or Cantonese when writing it. And also, it's a Chinese government document in Shanghai: almost certainly simplified Chinese characters representing Mandarin Chinese.