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

k-notes-frontend/i18next.config.ts

@@ -0,0 +1,12 @@
+import { defineConfig } from 'i18next-cli';
+
+export default defineConfig({
+  locales: [
+    "en",
+    "pl"
+  ],
+  extract: {
+    input: "src/**/*.{js,jsx,ts,tsx}",
+    output: "public/locales/{{language}}/{{namespace}}.json"
+  }
+});