Added the Korean (kr) language support

[WoonchanCho]

Hi team,

Thank you for all your efforts for implementing this create viewer.

I want to add the the Korean locales to the viewer.

If you prefer letting me to work on the Locize, you can create the space for the Korean language and let me know too.

Thank you in advance for your support.

[codecov[bot]]

Codecov Report

Merging #2470 (d6ce5e8) into master (d575e36) will not change coverage. The diff coverage is n/a.

:exclamation: Current head d6ce5e8 differs from pull request most recent head cbfa629. Consider uploading reports for the commit cbfa629 to get more accurate results

@@           Coverage Diff           @@
##           master    #2470   +/-   ##
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  Coverage   13.33%   13.33%           
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  Files         288      288           
  Lines        7664     7664           
  Branches     1465     1465           
=======================================
  Hits         1022     1022           
  Misses       5378     5378           
  Partials     1264     1264           

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[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[sedghi]

base has changed, read more here https://github.com/OHIF/Viewers/issues/3477