Redirects not going to localized page

[johnzhou721]

Describe the bug

https://beeware.org/zh_CN/briefcase/ redirects to english page

Steps to reproduce

Goto https://beeware.org/zh_CN/briefcase/

Expected behavior

Redirects to Chinese page

Screenshots

Irrelevant

Environment

Irrelevant

Logs

Irrelevant

Additional context

None

[freakboy3742]

Interesting - looks like we're missing URL language transforms in the redirect.html template that implements redirects.