i18n(de): add solid integration guide

[DerTimonius]

Description (required)

supersedes #8148

This PR adds the missing german translation for the SolidJS integration guide

I checked the original docs again and added what was missing

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Name	Status	Preview	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	Jun 24, 2024 0:55am

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Locale	File	Note
de	guides/integrations-guide/solid-js.mdx	Localization added, will be marked as complete.

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🔄️	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.

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[DerTimonius]

oh, did not see that this is still open... @Maxframe I don't have any more questions here, so this should be good to go