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static/js/language.js

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+document.addEventListener('DOMContentLoaded', function() {
+  // Only run on the home page to avoid redirect loops
+  if (window.location.pathname === '/') {
+      const userLang = navigator.language || navigator.userLanguage;
+      const currentLang = document.documentElement.lang;
+      
+      // Simple language mapping
+      const supportedLanguages = {
+          'de': '/de/',
+          'de-DE': '/de/',
+          'de-AT': '/de/',
+          'de-CH': '/de/',
+          'en': '/en/',
+          'en-US': '/en/',
+          'en-GB': '/en/'
+      };
+
+      // Check if user's language is different from current and is supported
+      if (supportedLanguages[userLang] && currentLang !== userLang.substring(0,2)) {
+          window.location.href = supportedLanguages[userLang];
+      }
+  }
+});