feat(i18n): implement backward-compatible alias for security settings

frontend/src/i18n/index.js

@@ -126,6 +126,25 @@ function mergeLocaleChunks(chunks) {
   return chunks.reduce((acc, chunk) => deepMerge(acc, chunk), {});
 }
 
+// Backward-compatible alias: if settings.security is missing,
+// reuse settings.account so renamed keys resolve immediately.
+function ensureSecuritySettingsAliases(allMessages) {
+  for (const localeCode of Object.keys(allMessages)) {
+    const localeMessages = allMessages[localeCode];
+    if (!isPlainObject(localeMessages)) {
+      continue;
+    }
+
+    if (!isPlainObject(localeMessages.settings)) {
+      continue;
+    }
+
+    if (!isPlainObject(localeMessages.settings.security) && isPlainObject(localeMessages.settings.account)) {
+      localeMessages.settings.security = localeMessages.settings.account;
+    }
+  }
+}
+
 const cebLocaleChunks = [
   enGeneral,
   enHeader,
@@ -256,6 +275,8 @@ const messages = {
   },
 };
 
+ensureSecuritySettingsAliases(messages);
+
 const i18n = createI18n({
   locale: store.state.language,
   fallbackLocale: {