Chinese phone numbers might not receive verification code if language variable is not set

### Version

v0.10.2

### What happened?

Somebody opened a PR for steamauth for this: https://github.com/geel9/SteamAuth/pull/99

This is specifically for `IPhoneService/SendPhoneVerificationCode`

### Steps To Reproduce

_No response_

### Relevant log output

_No response_