Preview of German translation

[microbit-matt-hillsdon]

To review first:

• https://github.com/microbit-foundation/micropython-microbit-stubs/pull/96
• https://github.com/microbit-foundation/pyright/pull/31

[github-actions[bot]]

Preview build will be at https://review-python-editor-v3.microbit.org/de-preview/

[microbit-robert]

I've added a couple of comments to the type stubs PR. Otherwise, this looks good. Everything I expect to be translated is.