Language variable during "SCCM Install for system"


We are using SCCM - install for system for deploying application. We need to recognize user interface current language. VAriables currentLanguage and currentUILanguage are returning env status of console running as user SYSTEM and language EN.

Is there any variable I can use ? ( PSADT is able to recognize it - user installation interface is in national language - SK )

Is $env:LANG - ussable?