fix: add contentDir, footer legal links (Impressum + Datenschutz)

- Restore contentDir for EN/DE (lost in config migration)
- Fixes /about/ 404 and DE content nesting under /en/
- Add Impressum + Datenschutzerklärung footer links to agiliton.eu

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

config/_default/languages.de.toml

@@ -4,6 +4,7 @@ languageDirection = "ltr"
 weight = 2
 
 title = "Internet für Kinder"
+contentDir = "content/de"
 
 [params]
   description = "Experteneinblicke zu Kinderschutzgesetzen, Online-Sicherheit und digitalem Familienschutz weltweit."
@@ -28,3 +29,19 @@ title = "Internet für Kinder"
   name = "Themen"
   url = "/tags/"
   weight = 3
+
+[[menus.footer]]
+  identifier = "impressum"
+  name = "Impressum"
+  url = "https://www.agiliton.eu/impressum"
+  weight = 1
+  [menus.footer.params]
+    external = true
+
+[[menus.footer]]
+  identifier = "privacy"
+  name = "Datenschutzerklärung"
+  url = "https://www.agiliton.eu/datenschutz"
+  weight = 2
+  [menus.footer.params]
+    external = true