Teamcenter Enterprise Active Workspace Hosted in Nx language

Is it posible to to see Active Workspace Hosted  in Nx in a language and NX user interface in another language

No, this is current not possible (not supported),  Nx uses the Language defined in UGII_LANG for the NX user interface and for the Hosted Active Workspace.

Nx will try to access to the url of the localized language.

In some versions it can fail because the Language has not been installed in Activeworkspace