Define translation agent skill guidelines for Japanese (ja) locale

[jason810496]

The context for this issue is described in #61984.

[HARDIK-WEB-OSS]

Hi @jason810496, I’d like to claim the Japanese (ja) locale. I’m manually reviewing the existing translations in the UI folder to keep the guidelines consistent. Please assign this to me.

[jason810496]

Thanks @HARDIK-WEB-OSS for helping out!