Fourth Korean l10n work for release-1.15 (#16063)

* ko: update translation in reference/glossary/* (#15776)
* Update outdated files partly in dev-1.15-ko.4 (#15856)
* ko: update translation in tasks/debug-application-cluster/resource-metrics-pipeline (#15798)
* ko: translate setup/production-environment/tools/control-plane-flags (#15820)
* ko: translate user-guide-windows-containers (#15730)
* ko: update translation in reference/glossary/* (#15761)
* ko: Update outdated files partly in dev-1.15-ko.4 (#15790)
* ko: fix corrupt date in glossary/static-pod (#15911)
* ko: translate user-guide-windows-nodes (#15759)
* Translate /docs/concepts/configuration/overview/ in Korean (#15803)
* ko: translate setup/production-environment/tools/ha-topology (#15819)
* ko: translate tasks/administer-cluster/network-policy-provider (#15846)
* Translate tasks/inject-data-application/define-command-argument-container in Korea (#15933)
* ko: translate concepts/configuration/organize-cluster-access-kubeconfig (#15871)
* Translate working-with-objects/common-labels.md in Korean (#15832)
* Translate concepts/workloads/pods/disruptions.md in Korean (#15926)
* Translate tasks/access-application-cluster/web-ui/dashboard in Korean (#15852)
* Translate concepts/overview/working-with-objects/labels.md in Korean (#15831)
* ko: translate guestbook-logs-metrics-with-elk (#15894)
* ko: translate tasks/administer-cluster/highly-available-master (#15928)

Co-Authored-By: Yoon <learder@gmail.com>
Co-Authored-By: Eden <longlg88@naver.com>
Co-Authored-By: Yuk, Yongsu <ysyukr@gmail.com>
Co-Authored-By: June Yi <june.yi@samsung.com>
Co-Authored-By: Seokho Son <shsongist@gmail.com>
Co-Authored-By: Lawrence Kay <lkay9495@hotmail.com>
Co-Authored-By: alice_k106 <alice_k106@naver.com>
Co-Authored-By: Cheolgu Kim <lapee79@gmail.com>

content/ko/docs/reference/glossary/certificate.md

@@ -0,0 +1,18 @@
+---
+title: 인증서(Certificate)
+id: certificate
+date: 2018-04-12
+full_link: /docs/tasks/tls/managing-tls-in-a-cluster/
+short_description: >
+  암호화된 안전한 파일로 쿠버네티스 클러스터 접근 검증에 사용한다.
+
+aka:
+tags:
+- security
+---
+암호화된 안전한 파일로 쿠버네티스 클러스터 접근 검증에 사용한다.
+
+<!--more-->
+
+인증서는 쿠버네티스 클러스터에서 애플리케이션이 쿠버네티스 API에 안전하게 접근할 수 있게 한다. 인증서는 클라이언트의 API 접근 허용 여부를 검증한다.
+