i18n(de): Follow i18n guide in islands.mdx

[randomguy-2650]

Description

This PR updates the islands.mdx file to follow the German i18n guide more closely.

Related issues & labels

• Suggested label: i18n

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Tracked Files

File	Note
de/concepts/islands.mdx	Localization changed, will be marked as complete.
de/concepts/why-astro.mdx	Localization changed, will be marked as complete. 🔄️

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[trueberryless]

Awesome changes, I really like your usage of the non-breaking Unicode symbol 🙌

I left some suggestions / questions...

[trueberryless]

LGTM 🎉🎈🥳

Thanks for the improvementa, randomguy

[yanthomasdev]

Thanks @randomguy-2650, could you also apply the changes from ec6a116 here? Should be a quick one, then we are good to merge!

[yanthomasdev]

Thanks! Good job 🙌