fix: hotfix middleware redirect available languages

Author: ovflowd

middleware.ts

@@ -19,7 +19,10 @@ export const middleware = async (request: NextRequest) => {
 
   // If we already have a NEXT_LOCALE Cookie, then Redirect to the stored Locale Code
   if (localeCookie?.value && localeCookie.value !== 'default') {
-    return redirectWithLocale(localeCookie.value);
+    // If the language by any reason is not available anymore, ignore the cookie
+    if (availableLocales.some(locale => locale.code === localeCookie.value)) {
+      return redirectWithLocale(localeCookie.value);
+    }
   }
 
   // If not, we try to check if the Browser is sending `Accept-Language` Header