i18n(de): add preact integration guide

[DerTimonius]

Description (required)

This PR adds the missing german translation for the preact integration guide. I also made small change to the english version as the tutorial on the preact website is no longer called Learn Preact in 10 minutes, just Learn Preact.

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Name	Status	Preview	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	May 2, 2024 7:42am

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Locale	File	Note
de	guides/integrations-guide/preact.mdx	Localization added, will be marked as complete.
en	guides/integrations-guide/preact.mdx	Source changed, localizations will be marked as outdated.

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.

[yanthomasdev]

Hey @DerTimonius, this PR ended up being stale, sorry for that! Could you please open a separate PR for this English change? And if you're willing to, another one with the translation updated with the recent changes? I am closing this one but I totally welcome new PRs, I'll be sure to get to them quickly next time.