[WIP] Copilot Request

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>implement support for both english and danish</issue_title>
<issue_description>Implement Astro starlight's preferred solution for supporting pages in dual language.

Let English be the main language and the danish the secondary.

If any page only exist in one language, make the de default for "the other" option too.

Do not create any other content yet — except translating the current pages,</issue_description>

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