There was an awful bug in the French translation of the game, that Ubi Soft never fixed (I guess that's the reason they only put the english version of the game in the french release of the 2007 'HoMM Anthology' when all other episodes were available in French.

Question is : Was the bug fixed in the GoG release ?

If not, know that playing in french, the game could freeze when entering a spécific location (a Temple or a Cave, I don't remember), due to a Typo in the localized data files.