feat: add first draft of german translation.

[franziska-warncke]

Added a first draft of german translation.

What is still needed:

• A writer review to make sure the translation went well ✅
• Translation of the images ✅

[russelltrow]

Hey @franziska-warncke when might you get chance to review @cdhaens feedback please?

[franziska-warncke]

Sorry, I was on vacation and after that I got sick. I will look into this now. :)

[franziska-warncke]

@tamarau Can you please have a look again. Thanks 🌻

[russelltrow]

Hey @franziska-warncke are you happy for us to merge this and then pick-up any further changes later?

I'm aware you've been working on this for a while now.

[franziska-warncke]

@russelltrow Let me add the pictures, and then it is ready for merging! :) I will quickly do that :)

[franziska-warncke]

Done! It is now ready to be merged :)

[franziska-warncke]

Good catch! :) This missing picture dont needed a translation - I think this is why I missed that. Now everything should be working, I tested it locally. Please have a look again - maybe there is still something missing. Thank you 🌻