The Language Pack in AutoCAD 2018 operates by installing a parallel set of resource files (DLLs, UI definitions, and documentation) and modifying the Windows Registry to point the application toward these resources upon launch.
For network deployments, Language Packs are integrated into the initial deployment package via the Autodesk Customization Wizard or included in the deployment creation wizard on the network server. This allows a single push installation to install AutoCAD with English and, for example, German support simultaneously. autocad 2018 language packs