feat(v2): Add korean default translations

[koko8829]

Motivation

Add a Korean translation for Korean users.

Have you read the Contributing Guidelines on pull requests?

Yes.

Test Plan

Skip.

Related PRs

Skip.

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[netlify]

[V1] Deploy preview failure

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[netlify]

Deploy preview for docusaurus-2 ready!

Built without sensitive environment variables with commit 5dd9130

https://deploy-preview-4390--docusaurus-2.netlify.app

[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟢 Performance	96
🟢 Accessibility	96
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	95

Lighthouse ran on https://deploy-preview-4390--docusaurus-2.netlify.app/classic/

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Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[slorber]

thanks 👍