feat: Implement internationalization with react-i18next, add translation files, and integrate language switching across components.

k-notes-frontend/i18n.ts

@@ -0,0 +1,23 @@
+import i18next from "i18next";
+import { initReactI18next } from "react-i18next";
+import HttpBackend from "i18next-http-backend";
+import LanguageDetector from "i18next-browser-languagedetector";
+
+i18next
+    .use(HttpBackend)
+    .use(LanguageDetector)
+    .use(initReactI18next)
+    .init({
+        fallbackLng: "en",
+        supportedLngs: ["en", "pl"],
+        backend: {
+            loadPath: "/locales/{{lng}}/{{ns}}.json",
+        },
+        detection: {
+            order: ["localStorage", "navigator"],
+            caches: ["localStorage"],
+        },
+        interpolation: {
+            escapeValue: false,
+        },
+    });