Update ko-KR/plugin.ts

[w4-jinhyeonkim]

Summary

Fixed some korean translations in plugin.ts

I also noticed that line 181 "sortBy" is translated as "black city" in many other languages as well, including fr-FR, ja-JP, zh-Hant.

Please take a look.

Fix #12883

Checklist

Important

Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods