add Japanese info text of core nodes

[HiroyasuNishiyama]

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

Proposed changes

This PR adds Japanese info text of core nodes.
Requires fix PR#1616 for message lookup of core nodes.

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 87.755% when pulling c3c5194 on node-red-hitachi:i18n-info-jp into 50ae815 on node-red:master.

[coveralls]

Coverage remained the same at 87.755% when pulling c3c5194 on node-red-hitachi:i18n-info-jp into 50ae815 on node-red:master.