Writing language files into the AutoCAD program folder (typically C:\Program Files\Autodesk\AutoCAD 2017 ) requires administrator privileges.
This document explains the functionality, installation, and limitations of language packs for AutoCAD 2017. autocad 2017 language pack work
You can copy this new shortcut to your desktop for quicker access. How to change the language of AutoCAD products - Autodesk Writing language files into the AutoCAD program folder