feat(i18n): enhance data fetching and caching with language support

- Update data-fetching functions to include language and translation request parameters for improved internationalization.
- Modify caching logic in Content and GrowTentKonfigurator components to utilize language-aware cache keys.
- Ensure ProductDetailPage retrieves cached data based on the current language, enhancing user experience across different locales.
- Integrate language handling in various components to maintain consistency in data management and rendering.

prerender/renderer.cjs

@@ -193,14 +193,17 @@ const renderPage = (
   let productDetailCacheScript = '';
   if (productData && productData.product) {
     // Cache the entire response object (includes product, attributes, etc.)
+    // Use language-aware cache key (prerender defaults to German)
     const productDetailCacheData = JSON.stringify(productData);
+    const language = 'de'; // Prerender system caches German version
+    const cacheKey = `product_${productData.product.seoName}_${language}`;
     productDetailCacheScript = `
     <script>
       // Populate window.productDetailCache with complete product data for SPA hydration
       if (!window.productDetailCache) {
         window.productDetailCache = {};
       }
-      window.productDetailCache['${productData.product.seoName}'] = ${productDetailCacheData};
+      window.productDetailCache['${cacheKey}'] = ${productDetailCacheData};
     </script>
     `;
   }