diff --git a/app/initializers/set-html-lang.js b/app/initializers/set-html-lang.js
new file mode 100644
index 00000000000..4899cbf76f5
--- /dev/null
+++ b/app/initializers/set-html-lang.js
@@ -0,0 +1,16 @@
+export function initialize(appInstance) {
+  try {
+    const intl = appInstance.lookup('service:intl');
+
+    if (intl && typeof document !== 'undefined') {
+      const lang = intl?.locale?.[0] || 'en';
+      document.documentElement.lang = lang;
+    }
+  } catch (e) {
+    console.error('Failed to set lang attribute:', e);
+  }
+}
+
+export default {
+  initialize
+};