fix(admin): polish reviews

Same select-all/row-checkbox accessible-name gap in table view; grid
view already had aria-label on its row checkbox (customer name),
table view was the gap. New adminModeration.selectAllRows key added
across en/ru/hy.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/i18n/en.ts

@@ -1219,6 +1219,7 @@ export const en: Translations = {
   },
   adminModeration: {
     search: 'Search by customer, product, or review text…',
+    selectAllRows: 'Select all reviews',
     allStatuses: 'All statuses',
     allRatings: 'All ratings',
     rating: 'Rating',