Civilization 2 Test of Time has several supported languages. To change the language download the appropriate language pack and extract all the files into your Civ2TT directory e.g C:\games\Civ2TT. Make sure to replace all the existing files with the ones you’ve extracted.
If you have any issues switching the language for Civilization 2 Test of Time please post them in the comments below. If you have language files for a language not listed here please send them to me and upload them!