Heroes of Might and Magic II Gold Edition: Mods, programming activities.

Recently, I've become very interested in the possibility of adjusting the translation of Heroes 2 by Buka. I'd like to bring back some features from the old, albeit buggy, translation by Fargus from 1997. For example: changing the names of some buildings, spells (one "oblom" instead of "curse" is worth mentioning), replacing the introductory campaign video with the video from the Fargus version, and so on.
The main question is: where is the text located and how can I work with it? Please help me.
Somehow, Fargus and Buka translated Heroes 2...