Update i18next and improve localization by integrating language detection. Refactor components to utilize translation functions for user-facing text, enhancing multilingual support across the application.

src/components/Chat2.tsx

@@ -50,7 +50,7 @@ function Chat2({ onClose }: Props) {
       <div className="p-4 pb-2">
         <div className="flex items-center justify-between border-b border-[#DAE0E5] pb-4">
           <p className="text-sm font-semibold">
-            <Trans i18nKey={"chat"}>Чат демонстрации</Trans>
+            <Trans i18nKey={"chat.demoChat"}>Чат демонстрации</Trans>
           </p>
           <Button
             variant="tertiary"