@kaming316: Chinese is not included in the language options as you can see on the upper part of this product page.

Ubisoft has/had some severe issues with distributing the Hazmat Gear Set, but they did manage to start the sendout to customers Uplay accounts yesterday evening (it was supposed to start at 10 am). If you have redeemed the preorder key on the activation website (details to be found in your account), the Hazmat Gear DLC will be linked to your Uplay account.