feat(SEO): enhance product and category JSON-LD with shipping and return policy details

- Added merchant return policy and shipping details to the JSON-LD for both product and category schemas.
- Updated delivery method price to reflect the new shipping rate of 5.90 €.
- Improved localization files to include loading messages for products and updated various translations for consistency.

prerender/seo/category.cjs

@@ -65,6 +65,41 @@ const generateCategoryJsonLd = (category, products = [], baseUrl, config) => {
               name: config.brandName,
             },
             itemCondition: "https://schema.org/NewCondition",
+            hasMerchantReturnPolicy: {
+              "@type": "MerchantReturnPolicy",
+              applicableCountry: "DE",
+              returnPolicyCategory: "https://schema.org/MerchantReturnFiniteReturnWindow",
+              merchantReturnDays: 14,
+              returnMethod: "https://schema.org/ReturnByMail",
+              returnFees: "https://schema.org/FreeReturn",
+            },
+            shippingDetails: {
+              "@type": "OfferShippingDetails",
+              shippingRate: {
+                "@type": "MonetaryAmount",
+                value: 5.90,
+                currency: "EUR",
+              },
+              shippingDestination: {
+                "@type": "DefinedRegion",
+                addressCountry: "DE",
+              },
+              deliveryTime: {
+                "@type": "ShippingDeliveryTime",
+                handlingTime: {
+                  "@type": "QuantitativeValue",
+                  minValue: 0,
+                  maxValue: 1,
+                  unitCode: "DAY",
+                },
+                transitTime: {
+                  "@type": "QuantitativeValue",
+                  minValue: 2,
+                  maxValue: 3,
+                  unitCode: "DAY",
+                },
+              },
+            },
           },
         },
       })),

prerender/seo/product.cjs

@@ -106,6 +106,41 @@ const generateProductJsonLd = (product, baseUrl, config, categoryInfo = null) =>
         "@type": "Organization",
         name: config.brandName,
       },
+      hasMerchantReturnPolicy: {
+        "@type": "MerchantReturnPolicy",
+        applicableCountry: "DE",
+        returnPolicyCategory: "https://schema.org/MerchantReturnFiniteReturnWindow",
+        merchantReturnDays: 14,
+        returnMethod: "https://schema.org/ReturnByMail",
+        returnFees: "https://schema.org/FreeReturn",
+      },
+      shippingDetails: {
+        "@type": "OfferShippingDetails",
+        shippingRate: {
+          "@type": "MonetaryAmount",
+          value: 5.90,
+          currency: "EUR",
+        },
+        shippingDestination: {
+          "@type": "DefinedRegion",
+          addressCountry: "DE",
+        },
+        deliveryTime: {
+          "@type": "ShippingDeliveryTime",
+          handlingTime: {
+            "@type": "QuantitativeValue",
+            minValue: 0,
+            maxValue: 1,
+            unitCode: "DAY",
+          },
+          transitTime: {
+            "@type": "QuantitativeValue",
+            minValue: 2,
+            maxValue: 3,
+            unitCode: "DAY",
+          },
+        },
+      },
     },
   };