## What does this PR do?

Improve repo by translations `zh` for HOWTO and CODE_OF_CONDUCT. Refer to issue #6782.



## Follow-up

- [x] Check the status of GitHub Actions and resolve any reported warnings!

- [x] I have checked, there is no ongoing PR that involves zh translations



## Notes

- This is my first open source contribution. Please give me feedback on how can I improve or do better :)