feat: add Polish and English language switcher

components/ui/theme-toggle.tsx

@@ -3,10 +3,12 @@
 import { useEffect, useState } from "react";
 import { Moon, Sun, SunMoon } from "lucide-react";
 import { Button } from "@/components/ui/button";
+import { useI18n } from "@/lib/i18n";
 
 export function ThemeToggle() {
   const [mounted, setMounted] = useState(false);
   const [isDark, setIsDark] = useState(false);
+  const { t } = useI18n();
 
   useEffect(() => {
     const root = document.documentElement;
@@ -39,7 +41,7 @@ export function ThemeToggle() {
     <Button
       variant="icon"
       type="button"
-      aria-label={!mounted ? "Zmień motyw" : isDark ? "Włącz jasny motyw" : "Włącz ciemny motyw"}
+      aria-label={!mounted ? t("theme.change") : isDark ? t("theme.light") : t("theme.dark")}
       onClick={toggleTheme}
     >
       {!mounted ? <SunMoon className="size-4" /> : isDark ? <Sun className="size-4" /> : <Moon className="size-4" />}