Add support for display nickname in team-members in danger

What does this MR do and why?

Related: https://jihulab.com/jihulab/engineering/team-members/-/issues/33
https://jihulab.com/jihulab/engineering/team-members/-/merge_requests/101

Replace Jihulab Username to Nickname in danger roulette
Add category for jh/locale to docs

Screenshots or screen recordings

Before

After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.