Universities in non-English speaking countries often teach Civil 3D in the local language. However, tutorials and online forums are predominantly English. A professor can swap the UI to English for a complex tutorial, then back to the local language for examinations.
If you already have Civil 3D installed in English and need to add Spanish capability: civil 3d language pack
Autodesk typically offers packs for the following (availability varies by version): civil 3d language pack