refactor: complete JS i18n migration for confirm dialogs and toast messages

Migrate 34 hardcoded user-facing strings to use I18n.t() for translation:

- CMS: media file operations (5 strings)
- Marketplace: Letzshop integration (16 strings)
- Messaging: notifications, messages, email templates (5 strings)
- Tenancy: platform modules, menu config, theme (5 strings)
- Core: menu config, settings, storefront cart (5 strings)
- Catalog: product creation (3 strings)
- Utils: clipboard operations (2 strings)

Added confirmations and messages keys to module locale files.
Added I18n.loadModule() calls to JS files that were missing them.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/modules/marketplace/static/admin/js/letzshop.js

@@ -64,6 +64,9 @@ function adminLetzshop() {
         vendorOrders: [],
 
         async init() {
+            // Load i18n translations
+            await I18n.loadModule('marketplace');
+
             // Guard against multiple initialization
             if (window._adminLetzshopInitialized) {
                 return;
@@ -188,7 +191,7 @@ function adminLetzshop() {
          * Delete vendor configuration
          */
         async deleteVendorConfig() {
-            if (!confirm('Are you sure you want to remove Letzshop configuration for this vendor?')) {
+            if (!confirm(I18n.t('marketplace.confirmations.remove_letzshop_config_vendor'))) {
                 return;
             }
 

app/modules/marketplace/static/admin/js/marketplace-letzshop.js

@@ -227,6 +227,9 @@ function adminMarketplaceLetzshop() {
         },
 
         async init() {
+            // Load i18n translations
+            await I18n.loadModule('marketplace');
+
             marketplaceLetzshopLog.info('init() called');
 
             // Guard against multiple initialization
@@ -1007,7 +1010,7 @@ function adminMarketplaceLetzshop() {
         async declineOrder(order) {
             if (!this.selectedVendor) return;
 
-            if (!confirm('Are you sure you want to decline this order? All items will be marked as unavailable.')) return;
+            if (!confirm(I18n.t('marketplace.confirmations.decline_order'))) return;
 
             try {
                 await apiClient.post(`/admin/letzshop/vendors/${this.selectedVendor.id}/orders/${order.id}/reject`);
@@ -1125,7 +1128,7 @@ function adminMarketplaceLetzshop() {
         async confirmAllItems(order) {
             if (!this.selectedVendor) return;
 
-            if (!confirm('Are you sure you want to confirm all items in this order?')) return;
+            if (!confirm(I18n.t('marketplace.confirmations.confirm_all_items'))) return;
 
             try {
                 await apiClient.post(
@@ -1146,7 +1149,7 @@ function adminMarketplaceLetzshop() {
         async declineAllItems(order) {
             if (!this.selectedVendor) return;
 
-            if (!confirm('Are you sure you want to decline all items in this order?')) return;
+            if (!confirm(I18n.t('marketplace.confirmations.decline_all_items'))) return;
 
             try {
                 await apiClient.post(
@@ -1238,7 +1241,7 @@ function adminMarketplaceLetzshop() {
         async deleteCredentials() {
             if (!this.selectedVendor) return;
 
-            if (!confirm('Are you sure you want to remove the Letzshop configuration? This will disable all Letzshop features for this vendor.')) {
+            if (!confirm(I18n.t('marketplace.confirmations.remove_letzshop_config'))) {
                 return;
             }
 
@@ -1456,7 +1459,7 @@ function adminMarketplaceLetzshop() {
          * Ignore an exception
          */
         async ignoreException(exception) {
-            if (!confirm('Are you sure you want to ignore this exception? The order will still be blocked from confirmation.')) {
+            if (!confirm(I18n.t('marketplace.confirmations.ignore_exception'))) {
                 return;
             }
 
@@ -1540,7 +1543,7 @@ function adminMarketplaceLetzshop() {
                 if (job.type === 'import') {
                     const errors = response.errors || [];
                     if (errors.length === 0) {
-                        Utils.showToast('No error details available', 'info');
+                        Utils.showToast(I18n.t('marketplace.messages.no_error_details_available'), 'info');
                         return;
                     }
                     // Store errors and show in job details modal
@@ -1553,7 +1556,7 @@ function adminMarketplaceLetzshop() {
                 }
             } catch (error) {
                 marketplaceLetzshopLog.error('Failed to load job errors:', error);
-                Utils.showToast('Failed to load error details', 'error');
+                Utils.showToast(I18n.t('marketplace.messages.failed_to_load_error_details'), 'error');
             }
         },