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Summary
This PR adds a couple of tools to improve the experience for translators.
It adds a couple of top level commands:
npm run i18n:status -> prints progress bars for each locale
npm run i18n:list -> lists locales and the percentage of completion
Also moves the former copy/missing translation commands to this top level variant (check docs).
Also adds docs.
How to test
Check the docs and run the commands to test them out.