First Korean l10n work for release-1.19

- Translate tasks/job/parallel-processing-expansion.md into Korean (#23544)
- Fix issue with ko/docs/concepts/workloads/controllers/job.md (#23720)
- Translate reference/scheduling/policies.md in Korean (#23690)
- Update outdated files in the dev-1.19-ko.1 branch (#23702)
- Modify translation access by Korean glossary (#23627)

Co-authored-by: Jerry Park <jaehwa@gmail.com>
Co-authored-by: junghyeonsu <54893898+junghyeonsu@users.noreply.github.com>
Co-authored-by: coolguyhong <podolsmith@naver.com>

content/ko/_index.html

@@ -41,11 +41,6 @@ Google이 일주일에 수십억 개의 컨테이너들을 운영하게 해준
         <button id="desktopShowVideoButton" onclick="kub.showVideo()">Watch Video</button>
         <br>
         <br>
-        <a href="https://events.linuxfoundation.org/kubecon-cloudnativecon-europe/?utm_source=kubernetes.io&utm_medium=nav&utm_campaign=kccnceu20" button id="desktopKCButton">Attend KubeCon EU virtually on August 17-20, 2020</a>
-        <br>
-        <br>
-        <br>
-        <br>
         <a href="https://events.linuxfoundation.org/kubecon-cloudnativecon-north-america/?utm_source=kubernetes.io&utm_medium=nav&utm_campaign=kccncna20" button id="desktopKCButton">Attend KubeCon NA virtually on November 17-20, 2020</a>
 </div>
 <div id="videoPlayer">