I just found back the thread fixing the problem and give it another reply to put it on top.
But all problems known so far were concerning, the menu.txt, where one lines need to be changed, otherwise names don't correspond in the english version.
Yes, you're right : 1st MGE, then the official patch, then my no limits.
I hex edited a few number of the civ2.exe and they make all the difference. Menu.txt and game.txt are only used to say my patch is installed and to claim that 32767 squares maps are possible. If you use your original game.txt, the program will say only 10000 with random maps but shall accept 32767 anyway. No big deal.
I think and hope that a reinstallation shall make everything work properly.