Actually, you can use them with the english version too. I ran the file and when I entered the game, there was a small "campaign selection" window. If you run the pack, you can only start a new game, existing games won't be affected. I did the tutorial and already at the magic academy a new item (Dragon Eye) is for sale. (for 150.000 gold mind you). I expect item description will be in russian, but you can use Google translate for that.
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