i18n(de): update concepts/islands.mdx

[trueberryless]

Description (required)

• update concepts/islands.mdx

Related issues & labels (optional)

• Migrate Docs to Starlight #4266
• [islands] refreshed page content for 4.0 #5461
• Indentation fixes #1776
• Mark code in islands.md #1168
• Add code snippet titles to islands.md #1139
• Core Concepts PR follow-up #1126

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de/concepts/islands.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.

[jsparkdev]

As a non-native speaker, I have validated using a translator and AI, and have determined that all edits and content have been translated correctly, so I am happy to recommend LGTM!