Incubator-superset: Korean translation function does not work.

[kuckjwi0928]

Korean translation function does not work.

Expected results

Translation to Korean

Actual results

Maintaining in English

Screenshots

How to reproduce the bug

1. Go to menubar
2. Click the korean drop-down

Environment

• superset version: master
• python version: Python 3.7.4
• node.js version: v11.5.0
• npm version: 6.9.0

Checklist

• [ ] I have checked the superset logs for python stacktraces and included it here as text if there are any.
• [ ] I have reproduced the issue with at least the latest released version of superset.
• [x] I have checked the issue tracker for the same issue and I haven't found one similar.

Additional context

No

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[kuckjwi0928]

I will fix this issue.