The only real tests for translation we have are a) user feedback and b) i18n.nodered.org which is a visual inspection after publishing so yes please to the PR.
But note it should be targeted against the dev branch on github not master as dev is where new features need to go.
Dashboard would be good, and there are a few core nodes in node-red-nodes project (.like serialport twitter etc), but concentrate on the core first.
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