To switch languages in AutoCAD 2014, the system modifies the following Registry Key: HKEY_CURRENT_USER\Software\Autodesk\AutoCAD\R19.1\ACAD-D001:409

Avoid third-party "cracked" language packs. They often contain malware or corrupt your AutoCAD installation. Always use official Autodesk sources.

. While officially retired from Autodesk, these packs are generally installed by running a downloaded .exe file with AutoCAD closed

“No,” said AutoCAD 2014. “I learned something. A single perfect language is a dream. But a toolbox full of real, imperfect, living languages—that is how you build a world.”

They are much smaller than a full software installation.