Update navigation links from "Home" to "Startseite" and search input placeholders from "Search..." to "Suchen..." across multiple pages for German language support. Also, modifies a loading message in `GeschichteLiedPage.tsx` from "Loading GESCHICHTE VUM LIED..." to "Loading GESCHICHTE DES LIEDES...". The footer structure in `home.tsx` is also refactored.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 2cd2c0bc-434c-4bc9-ad3f-b99d3897a0d1
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/8cc42625-c1f5-4e43-99bd-77f2c4dedee2/2cd2c0bc-434c-4bc9-ad3f-b99d3897a0d1/4DOsXkx