german translation for node generator swagger node template

[janacaba]

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

Proposed changes

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

[kazuhitoyokoi]

@janacaba Thank you for your contribution!

[coveralls]

Coverage remained the same at 77.812% when pulling 42f8be9 on janacaba:master-supportgerman into 6b88422 on node-red:master.