Turning German into English version?

[Husar]

Some features aren't even translated..., merchants, for instance, trade in English: "...ce marchand vend du... silk", or "il vend du... iron" etc.

Same in the german version, guess the game gets the names for the ressources right out of some ressources file, IIRC RTW had some text files with the translated texts and words.
But there is a localized.pack file in the packs-folder, maybe putting an english file there would change it, if the english version doesn't even have that file, simply renaming it might do the trick.

edit: renaming it didn't do anything for me.