Null translations of new 2.1 beta 3 content.

[microbit-matt-hillsdon]

This exposes the new API in the translated langauges but still with English as there has been no opportunity for actual translation.

See https://github.com/microbit-foundation/micropython-microbit-stubs/pull/71 for further details.

[github-actions[bot]]

Preview build will be at https://review-python-editor-next.microbit.org/translations/