feat(i18n): add danish localization

components/ui/flag-icons.tsx

@@ -201,6 +201,16 @@ export function FlagCS(props: FlagProps) {
   );
 }
 
+/** Danish flag - Red with a white cross */
+export function FlagDa(props: FlagProps) {
+  return (
+    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 37 28" width={W} height={H} className={flagClass} {...props}>
+      <path fill="#c8102e" d="M0,0H37V28H0Z" />
+      <path stroke="#fff" stroke-width="4" d="M0,14h37M14,0v28" />
+    </svg>
+  );
+}
+
 /** Map locale codes to flag components */
 export const flagComponents: Record<string, (props: FlagProps) => ReactElement> = {
   en: FlagGB,

components/ui/language-switcher.tsx

@@ -13,9 +13,10 @@ const languages = [
   { value: 'fr', label: 'Français' },
   { value: 'ja', label: '日本語' },
   { value: 'ko', label: '한국어' },
+  { value: 'da', label: 'Danish' },
+  { value: 'de', label: 'Deutsch' },
   { value: 'es', label: 'Español' },
   { value: 'it', label: 'Italiano' },
-  { value: 'de', label: 'Deutsch' },
   { value: 'lv', label: 'Latviešu' },
   { value: 'nl', label: 'Nederlands' },
   { value: 'pl', label: 'Polski' },