Add Korean locales files for nodes

[LEEHYUKJOO]

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Proposed changes

Add Korean locales file for nodes.

ko

• core
• hardware
• io
• logic
• parsers
• storage
• messages.json

Checklist

• I have read the contribution guidelines
• For non-bugfix PRs, I have discussed this change on the mailing list/slack team.
• I have run grunt to verify the unit tests pass
• I have added suitable unit tests to cover the new/changed functionality

[coveralls]

Coverage remained the same at 76.398% when pulling d6bd352 on node-red-hitachi:master-korean into 962a291 on node-red:master.