Chat SDK's Chat Bot does not speak Chinese on iOS but does on Android.

Hello, 

I been integrating Zendesk Chat to our app recently, but came across with this problem.

The Chat bot on iOS would not speak Chinese even if the system language is set to Chinese and region is China, it's aways English.

But on Android it works fine, the chat bot would speak languages corresponded to the system language.

Any help would be appreciated.

Thanks!