Wrong fallback language in German Docs

Describe the bug

In the German translation of the Documentation there are parts where the untranslated fallback language isn't English.

Steps to reproduce

1. Open Docs
2. Set language to Deutsch
3. Go to https://docs.castopod.org/main/de/getting-started/update/#update-instructions

Expected behavior

All non German strings should be in English

Actual behavior

Some of them are in Slovenian and possibly other languages.

Relevant logs and/or screenshots

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Context

• Castopod: https://docs.castopod.org
• OS: Linux
• Browser: Firefox

Possible fixes

I already changed some of it on Crowdin back to English or translated it to German, however I am not so well versed with Crowdin as translation tool so I had issues finding the strings from the Docs inside of Crowdin. Maybe someone could revert all non German strings within the German translation back to English(automated or so)