Translations are wrapped in code blocks. Chinese has several variants, so it's needed to create three subpages for a single message (/zh, /zh-hans, /zh-hant). Text in bold are the messages' name.
mw-download
/zh, /zh-hans: 下载MediaWiki
/zh-hant: 下載MediaWiki
mw-extensions
/zh, /zh-hans: 下载扩展
/zh-hant: 下載擴充功能
mw-communication
/zh, /zh-hans: 联系交流
/zh-hant: 聯絡交流
mw-bugtracker
/zh, /zh-hans: 漏洞跟踪器
/zh-hant: 錯誤追蹤器
The last request has been 4 years ago and still no one is implementing it, so I just post it again.