diff --git a/app/modules/catalog/static/admin/js/products.js b/app/modules/catalog/static/admin/js/products.js
index 7061eaad..8cce2210 100644
--- a/app/modules/catalog/static/admin/js/products.js
+++ b/app/modules/catalog/static/admin/js/products.js
@@ -405,7 +405,7 @@ function adminStoreProducts() {
          */
         formatPrice(price, currency = 'EUR') {
             if (price === null || price === undefined) return '-';
-            return new Intl.NumberFormat('en-US', {
+            return new Intl.NumberFormat(I18n.locale, {
                 style: 'currency',
                 currency: currency || 'EUR'
             }).format(price);
diff --git a/app/modules/cms/static/admin/js/content-pages.js b/app/modules/cms/static/admin/js/content-pages.js
index 49ae53f8..2c2d8691 100644
--- a/app/modules/cms/static/admin/js/content-pages.js
+++ b/app/modules/cms/static/admin/js/content-pages.js
@@ -272,7 +272,7 @@ function contentPagesManager() {
             } else if (diffDays < 7) {
                 return `${diffDays} days ago`;
             } else {
-                return date.toLocaleDateString('en-US', {
+                return date.toLocaleDateString(I18n.locale, {
                     year: 'numeric',
                     month: 'short',
                     day: 'numeric'
diff --git a/app/modules/core/static/storefront/js/storefront-layout.js b/app/modules/core/static/storefront/js/storefront-layout.js
index ec8f71bb..af16662f 100644
--- a/app/modules/core/static/storefront/js/storefront-layout.js
+++ b/app/modules/core/static/storefront/js/storefront-layout.js
@@ -233,7 +233,7 @@ function storefrontLayoutData() {
         formatDate(dateString) {
             if (!dateString) return '-';
             const date = new Date(dateString);
-            return date.toLocaleDateString('en-US', {
+            return date.toLocaleDateString(I18n.locale, {
                 year: 'numeric',
                 month: 'short',
                 day: 'numeric'
diff --git a/app/modules/inventory/static/admin/js/inventory.js b/app/modules/inventory/static/admin/js/inventory.js
index 46a32ff4..585674c9 100644
--- a/app/modules/inventory/static/admin/js/inventory.js
+++ b/app/modules/inventory/static/admin/js/inventory.js
@@ -489,7 +489,7 @@ function adminInventory() {
          */
         formatNumber(num) {
             if (num === null || num === undefined) return '0';
-            return new Intl.NumberFormat('en-US').format(num);
+            return new Intl.NumberFormat(I18n.locale).format(num);
         },
 
         /**
diff --git a/app/modules/marketplace/static/admin/js/imports.js b/app/modules/marketplace/static/admin/js/imports.js
index 7b62ef6d..18ec9313 100644
--- a/app/modules/marketplace/static/admin/js/imports.js
+++ b/app/modules/marketplace/static/admin/js/imports.js
@@ -387,7 +387,7 @@ function adminImports() {
 
             try {
                 const date = new Date(dateString);
-                return date.toLocaleString('en-US', {
+                return date.toLocaleString(I18n.locale, {
                     year: 'numeric',
                     month: 'short',
                     day: 'numeric',
diff --git a/app/modules/marketplace/static/admin/js/marketplace-product-detail.js b/app/modules/marketplace/static/admin/js/marketplace-product-detail.js
index 6f26ac0c..2408bd54 100644
--- a/app/modules/marketplace/static/admin/js/marketplace-product-detail.js
+++ b/app/modules/marketplace/static/admin/js/marketplace-product-detail.js
@@ -157,7 +157,7 @@ function adminMarketplaceProductDetail() {
          */
         formatPrice(price, currency = 'EUR') {
             if (price === null || price === undefined) return '-';
-            return new Intl.NumberFormat('en-US', {
+            return new Intl.NumberFormat(I18n.locale, {
                 style: 'currency',
                 currency: currency || 'EUR'
             }).format(price);
@@ -170,7 +170,7 @@ function adminMarketplaceProductDetail() {
             if (!dateString) return '-';
             try {
                 const date = new Date(dateString);
-                return date.toLocaleDateString('en-US', {
+                return date.toLocaleDateString(I18n.locale, {
                     year: 'numeric',
                     month: 'short',
                     day: 'numeric',
diff --git a/app/modules/marketplace/static/admin/js/marketplace-products.js b/app/modules/marketplace/static/admin/js/marketplace-products.js
index 07c8a554..bdd8d3b0 100644
--- a/app/modules/marketplace/static/admin/js/marketplace-products.js
+++ b/app/modules/marketplace/static/admin/js/marketplace-products.js
@@ -515,7 +515,7 @@ function adminMarketplaceProducts() {
          */
         formatPrice(price, currency = 'EUR') {
             if (price === null || price === undefined) return '-';
-            return new Intl.NumberFormat('en-US', {
+            return new Intl.NumberFormat(I18n.locale, {
                 style: 'currency',
                 currency: currency || 'EUR'
             }).format(price);
diff --git a/app/modules/marketplace/static/admin/js/marketplace.js b/app/modules/marketplace/static/admin/js/marketplace.js
index fb345b6c..2641ea89 100644
--- a/app/modules/marketplace/static/admin/js/marketplace.js
+++ b/app/modules/marketplace/static/admin/js/marketplace.js
@@ -453,7 +453,7 @@ function adminMarketplace() {
 
             try {
                 const date = new Date(dateString);
-                return date.toLocaleString('en-US', {
+                return date.toLocaleString(I18n.locale, {
                     year: 'numeric',
                     month: 'short',
                     day: 'numeric',
diff --git a/app/modules/monitoring/static/admin/js/imports.js b/app/modules/monitoring/static/admin/js/imports.js
index 7b62ef6d..18ec9313 100644
--- a/app/modules/monitoring/static/admin/js/imports.js
+++ b/app/modules/monitoring/static/admin/js/imports.js
@@ -387,7 +387,7 @@ function adminImports() {
 
             try {
                 const date = new Date(dateString);
-                return date.toLocaleString('en-US', {
+                return date.toLocaleString(I18n.locale, {
                     year: 'numeric',
                     month: 'short',
                     day: 'numeric',
diff --git a/app/modules/monitoring/static/admin/js/platform-health.js b/app/modules/monitoring/static/admin/js/platform-health.js
index b3b214fa..fafbd378 100644
--- a/app/modules/monitoring/static/admin/js/platform-health.js
+++ b/app/modules/monitoring/static/admin/js/platform-health.js
@@ -99,7 +99,7 @@ function adminPlatformHealth() {
             if (typeof num === 'number' && num % 1 !== 0) {
                 return num.toFixed(2);
             }
-            return new Intl.NumberFormat('en-US').format(num);
+            return new Intl.NumberFormat(I18n.locale).format(num);
         },
 
         /**
diff --git a/app/modules/orders/static/admin/js/orders.js b/app/modules/orders/static/admin/js/orders.js
index 1aef1efb..807751a5 100644
--- a/app/modules/orders/static/admin/js/orders.js
+++ b/app/modules/orders/static/admin/js/orders.js
@@ -540,7 +540,7 @@ function adminOrders() {
          */
         formatPrice(price, currency = 'EUR') {
             if (price === null || price === undefined) return '-';
-            return new Intl.NumberFormat('en-US', {
+            return new Intl.NumberFormat(I18n.locale, {
                 style: 'currency',
                 currency: currency || 'EUR'
             }).format(price);
diff --git a/app/modules/tenancy/static/admin/js/merchants.js b/app/modules/tenancy/static/admin/js/merchants.js
index bee2b710..13d253cb 100644
--- a/app/modules/tenancy/static/admin/js/merchants.js
+++ b/app/modules/tenancy/static/admin/js/merchants.js
@@ -257,7 +257,7 @@ function adminMerchants() {
             if (!dateString) return 'N/A';
             try {
                 const date = new Date(dateString);
-                return date.toLocaleDateString('en-US', {
+                return date.toLocaleDateString(I18n.locale, {
                     year: 'numeric',
                     month: 'short',
                     day: 'numeric'
diff --git a/static/shared/js/utils.js b/static/shared/js/utils.js
index 50a3f4cd..0f040174 100644
--- a/static/shared/js/utils.js
+++ b/static/shared/js/utils.js
@@ -15,7 +15,7 @@ const Utils = {
 
         try {
             const date = new Date(dateString);
-            return date.toLocaleDateString('en-US', {
+            return date.toLocaleDateString(I18n.locale, {
                 year: 'numeric',
                 month: 'short',
                 day: 'numeric'
@@ -36,7 +36,7 @@ const Utils = {
 
         try {
             const date = new Date(dateString);
-            return date.toLocaleString('en-US', {
+            return date.toLocaleString(I18n.locale, {
                 year: 'numeric',
                 month: 'short',
                 day: 'numeric',
@@ -59,7 +59,7 @@ const Utils = {
         if (amount === null || amount === undefined) return '-';
 
         try {
-            return new Intl.NumberFormat('en-US', {
+            return new Intl.NumberFormat(I18n.locale, {
                 style: 'currency',
                 currency: currency
             }).format(amount);
@@ -76,7 +76,7 @@ const Utils = {
      */
     formatNumber(num) {
         if (num === null || num === undefined) return '0';
-        return num.toLocaleString('en-US');
+        return num.toLocaleString(I18n.locale);
     },
 
     /**