i18n(de): update environmental-impact.md (#2692)

Co-authored-by: HiDeoo <494699+HiDeoo@users.noreply.github.com>

Author: trueberryless

docs/src/content/docs/de/environmental-impact.md

@@ -137,6 +137,6 @@ Diese Tests mit dem [Website Carbon Calculator][wcc] vergleichen ähnliche Seite
 [sf]: https://www.sciencefocus.com/science/what-is-the-carbon-footprint-of-the-internet/
 [bbc]: https://www.bbc.com/future/article/20200305-why-your-internet-habits-are-not-as-clean-as-you-think
 [http]: https://httparchive.org/reports/state-of-the-web
-[assets]: https://docs.astro.build/en/guides/assets/
-[islands]: https://docs.astro.build/en/concepts/islands/
+[assets]: https://docs.astro.build/de/guides/images/
+[islands]: https://docs.astro.build/de/concepts/islands/
 [wcc]: https://www.websitecarbon.com/