Define translation agent skill guidelines for Korean (ko) locale

[jason810496]

The context for this issue is described in #61984.

[teddygood]

Hi! I’d like to work on this issue. Could you please assign it to me?

[jason810496]

Thanks @teddygood!

[choo121600]

Cool, @teddygood :)
I might miss it when the PR is created, would you mind mentioning me on the PR for this work?