Knowledge Support Hub does not charge any additional costs. All of the features stated on our pricing page for help desk software, complete support, and all of our available customization choices are included in your subscription.
Knowledge Support Hub is available in English. You can request a language here. https://docs.google.com/forms/d/1Ar4qRdKizAI2ugATj8uURq029Xr1KdAH9tq3CsyNcTQ/edit