Added lang store

src/i18n/store.ts

@@ -0,0 +1,8 @@
+import { type Language } from './ui';
+import { persistentAtom } from '@nanostores/persistent';
+
+export const currentLang = persistentAtom<Language>('lang', "fr");
+
+export function setLang(lang: Language) {
+    currentLang.set(lang);
+}