Apply changes to translated pages: description about currying

[masmatsum]

In functional_programming.md, description about currying was fixed in ocaml/ocaml.org#1595 (diff).
We need to apply changes to translated pages:

• French: functional_programming.fr.md
• Italian: functional_programming.it.md
• Japanese: functional_programming.ja.md
• Chinese: functional_programming.zh.md

[masmatsum]

For Japanese page, I can create PR by myself (I am a native speaker of Japanese language).
Can anyone work on French, Italian and Chinese pages?

[kirisky]

Hi @masmatsum! I will take the Chinese version, I am a native speaker.

[masmatsum]

@kirisky
Thank you! 謝謝～

[kirisky]

@masmatsum
いいえ, my pleasure, mate! 😉