Revert "fix(footer): default nav + tagline when the tenant's CMS footer is empty"

This reverts the hardcoded footer fallback. The footer stays fully CMS-driven;
the unom tenant's footer will be populated to mirror punktfunk's instead.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

messages/de.json

@@ -14,11 +14,5 @@
 	"blog_empty": "Noch keine Beiträge.",
 	"blog_all": "Alle Beiträge",
 	"blog_latest_heading": "Aus dem Blog",
-	"blog_back": "Blog",
-
-	"footer_overview": "Übersicht",
-	"footer_home": "Startseite",
-	"footer_legal": "Rechtliches",
-	"footer_imprint": "Impressum",
-	"footer_privacy": "Datenschutz"
+	"blog_back": "Blog"
 }