🌐 [i18n-KO] Translated `model_doc/barthez.md` to Korean

[Jwaminju]

What does this PR do?

Translated the model_doc/barthez.md file of the documentation to Korean. Thank you in advance for your review.

Part of https://github.com/huggingface/transformers/issues/20179

Before reviewing

• [x] Check for missing / redundant translations (번역 누락/중복 검사)
• [x] Grammar Check (맞춤법 검사)
• [x] Review or Add new terms to glossary (용어 확인 및 추가)
• [x] Check Inline TOC (e.g. [[lowercased-header]])
• [ ] Check live-preview for gotchas (live-preview로 정상작동 확인)

Who can review? (Initial)

@junejae, @Jwaminju, @010kim, @4N3MONE, @boyunJang

Before submitting

• [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• [x] Did you read the contributor guideline, Pull Request section?
• [ ] Was this discussed/approved via a Github issue or the forum? Please add a link to it if that's the case.
• [x] Did you make sure to update the documentation with your changes? Here are the documentation guidelines, and here are tips on formatting docstrings.
• [ ] Did you write any new necessary tests?

Who can review? (Final)

@stevhliu May you please review this PR?

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[Jwaminju]

Hello, I'm looking into how to esolve the setup_and_quality failure. Thanks in advance!

Some diff and their modeling code did not match.

[stevhliu]

Hey, it looks like the setup_and_quality test is passing now. The build_pr_documentation issue has been resolved on main, so if you wouldn't mind, can you rebase your branch on it to get the fix? 🤗

[Jwaminju]

Hi, @stevhliu! Thanks you so much for your review :) I have rebased the branch! Best Regards, Minju