Fourth Korean localization work for release-1.14 (#14578)

This commit is the fourth Korean l10n work for release-1.14.

Change List

* Translate concepts/overview/object-management-kubectl/declarative-config in Korean (#14285)

* translate cron-jobs.md to korean + add _index.md (#14024)

* ko: update outdated files in dev-1.14-ko.4 #14207 (#14347)

* Translate standardized glossary Tag Workload in Korean (#14208)

* translate to content/ko/docs/concepts/cluster-administration/controll… (#14234)

* ko: update concepts, contribute, tasks in dev-1.14-ko.4 #14207 (#14502)

* ko: update cheatsheet in dev-1.14-ko.4  (#14515)

Co-Authored-By:    Woojin Na(Eddie) <kimchigood1130@gmail.com>
Co-Authored-By:    Kim Young Dae <38598117+zer0big@users.noreply.github.com>
Co-Authored-by:    Claudia J. Kang <claudiajkang@gmail.com>
Co-authored-by:    Yoon <learder@gmail.com>
Co-authored-by:    June Yi <june.yi@samsung.com>
Co-authored-by:    Seokho <shsongist@gmail.com>

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

@@ -0,0 +1,19 @@
+---
+title: 크론잡(CronJob)
+id: cronjob
+date: 2018-04-12
+full_link: /docs/concepts/workloads/controllers/cron-jobs/
+short_description: >
+  주기적인 일정에 따라 실행되는 [잡](/docs/concepts/workloads/controllers/jobs-run-to-completion/)을 관리.
+
+aka: 
+tags:
+- core-object
+- workload
+---
+ 주기적인 일정에 따라 실행되는 [잡](/docs/concepts/workloads/controllers/jobs-run-to-completion/)을 관리.
+
+<!--more-->
+
+*crontab* 파일의 라인과 유사하게, 크론잡 오브젝트는 [크론](https://en.wikipedia.org/wiki/Cron) 형식을 사용하여 일정을 지정한다.
+