Welcome!
The word you were looking for was "assistant director".
I believe that there is an organized, French-speaking fanbase for Dominions. You are welcome to take part in discussions here, but you might also want to check out this place:
http://www.net4war.com/forums/viewforum.php?f=55
There haven't been new posts since May, but someone there can probably direct you to a more active French forum.