Added lang attribute and helper functions

src/i18n/ui.ts

@@ -0,0 +1,4 @@
+export const availableLangs = ['en', 'fr'] as const;
+export type Language = typeof availableLangs[number];
+
+export const defaultLang: Language = 'fr';

src/i18n/utils.ts

@@ -0,0 +1,7 @@
+import { defaultLang, availableLangs, type Language } from './ui';
+
+export function getLangFromUrl(url: URL): Language {
+  const [, lang] = url.pathname.split('/');
+  if (availableLangs.includes(lang as Language)) return lang as Language;
+  return defaultLang
+}