Add Korean localization for Dashboard

[seokho-son]

This PR is to initiate Korean localization for Dashboard.

This PR modifies (1) i18n/locale_conf.json, (2) package.json to add "ko" as a new localization language.
Also, the PR includes i18n/messages.ko.xlf that includes actual translation contents.

I am one of @kubernetes/sig-docs-ko-owners , and we are happy to know about new Kubernetes Dashboard v2.0.0 and provide localization for Korean !! (Thank you @shu-mutou for your guidance)

cc to sig-docs-ko-reviews for checking any major issues in the Korean translation.
(Please note that this PR is for initiation of Korean localization for Dashboard. I did my best for the translation, but if there is a major issue, please let me know :) )
/cc @kubernetes/sig-docs-ko-reviews

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[codecov]

Codecov Report

Merging #4174 into master will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4174      +/-   ##
==========================================
+ Coverage   46.14%   46.18%   +0.03%     
==========================================
  Files         194      194              
  Lines        8999     8999              
  Branches       83       83              
==========================================
+ Hits         4153     4156       +3     
+ Misses       4591     4587       -4     
- Partials      255      256       +1

Impacted Files	Coverage Δ
src/app/backend/sync/secret.go	73.26% <0%> (+2.97%)	⬆️

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[shu-mutou]

Thank you for adding new l10n file! But a typo was found yesterday, and we need to refresh messages files now. Please wait #4173 merged. Then rebase to it, run npm run fix:i18n again and recheck your i18n file. Sorry for inconvinience.

[seokho-son]

Thank you for adding new l10n file! But a typo was found yesterday, and we need to refresh messages files now. Please wait #4173 merged. Then rebase to it, run npm run fix:i18n again and recheck your i18n file. Sorry for inconvinience.

I got it. I will rebase this PR after #4173 is merged. Thank you.
In the meantime, I hope to get comments from reviewers :)
/hold

[shu-mutou]

#4173 was merged. Please rebase this PR. Thanks. 😉

[shu-mutou]

This typo ("requestes") was fixed few days ago, so "trans-unit id" was changed. Please re-run npm run fix:i18n after rebasing, then check again this files. After running npm run fix:i18n, this typo will fixed and some "transunit" for new views will be added.

[seokho-son]

/hold cancel

[seokho-son]

@shu-mutou Thank you. I applied the fixed typo and translated the associated target into Korean.

[shu-mutou]

/lgtm
@seokho-son Great!! Thank you for addressing updates. If you have inconvinience about our i18n workflow or have ideas to improve, feel free to submit issue.

[floreks]

Great work. Thanks!

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floreks, seokho-son, shu-mutou

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