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.

src/i18n/locales/sq/delivery.js

@@ -16,7 +16,7 @@ export default {
   "prices": {
     "free": "falas",
     "freeFrom100": "(falas nga 100€)",
-    "dhl": "6.99 €",
+    "dhl": "5.90 €",
     "dpd": "4.90 €",
     "sperrgut": "28.99 €"
   },

src/i18n/locales/sq/product.js

@@ -25,6 +25,7 @@ export default {
   "pickupPrice": "Çmimi për marrje: 19,90 € për prerje.",
   "consistsOf": "Përbëhet nga:",
   "loadingComponentDetails": "{{index}}. Duke ngarkuar detajet e komponentit...",
+  "loadingProduct": "Produkti po ngarkohet...",
   "individualPriceTotal": "Çmimi total individual:",
   "setPrice": "Çmimi i setit:",
   "yourSavings": "Kursimet tuaja:",