i18n(de): update translation guides/customization

[trueberryless]

Description

Translation of guides/customization.mdx into German language.

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Tracked Files

Locale	File	Note
de	guides/customization.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.