[ko] Translate content/ko/docs/reference/glossary/contributor.md

[sinsehwan]

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Please delete this note before submitting the pull request.

For 1.13 Features: set Milestone to 1.13 and Base Branch to dev-1.13

Help editing and submitting pull requests:
https://kubernetes.io/docs/contribute/start/#improve-existing-content.

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https://kubernetes.io/docs/contribute/start#choose-which-git-branch-to-use.
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