Hello, i need add language to provisioning template for Grandstream 1450. I have 3CX phone system v 12. In previous version (v. 11) i modify some parameters in template (it's working perfect), but in version 12 it is not possible. I try this: http://www.3cx.com/blog/ip-phone-configuration/grandstream-display-language/ - I'ts not working. Please help.