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

[Janbubu]

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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

For Chinese localization, base branch to release-1.12

For Korean Localization: set Base Branch to dev-1.13-ko.

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

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

Related: issue #59