fix(storefront): replace hardcoded strings with i18n, neutral empty-state wording

- Route aria-label/alt/title strings (rating, discount, carousel arrows,
  hero slides, dialog close, toast dismiss, QR code, bank payment iframe,
  guest checkout fallback) through the translate pipe/service instead of
  literal English.
- Drop the "Oops!"/"Упс!" apology framing from category/subcategory empty
  states (en/ru/hy) - zero results is not an error.

src/app/i18n/en.ts

@@ -161,7 +161,7 @@ export const en: Translations = {
     addToCart: 'Add to cart',
     loadingMore: 'Loading...',
     allLoaded: 'All products loaded',
-    emptyTitle: 'Oops! Nothing here yet',
+    emptyTitle: 'Nothing here yet',
     emptyDesc: 'There are no products in this category yet, but they will appear soon',
     goHome: 'Go home',
     loading: 'Loading products...',
@@ -339,7 +339,7 @@ export const en: Translations = {
   subcategories: {
     loading: 'Loading subcategories...',
     retry: 'Try again',
-    emptyTitle: 'Oops! No subcategories yet',
+    emptyTitle: 'No subcategories yet',
     emptyDesc: 'There are no subcategories in this section yet, but they will appear soon',
     goHome: 'Go home',
     itemsInCategory: 'Items in this category',
@@ -1086,6 +1086,17 @@ export const en: Translations = {
     remove: 'Remove',
     errorTitle: 'Something went wrong',
     errorDescription: 'We could not load this data. Please try again.',
+    ratingLabel: 'Rating {{value}}',
+    discountLabel: 'Discount {{value}}%',
+    slideLabel: 'Slide {{value}}',
+    slidesLabel: 'Slides',
+    previousProducts: 'Previous products',
+    nextProducts: 'Next products',
+    closeDialog: 'Close dialog',
+    dismiss: 'Dismiss',
+    qrCode: 'QR Code',
+    bankCardPayment: 'Bank card payment',
+    guest: 'Guest',
   },
   location: {
     allRegions: 'All regions',