Hi Motorhead,
Indeed.
I never had the ";" in my DgenMod.ini, except one time to test your probable solution.
But as I told, it was another problem. "Language=english" is needed to set the briefing in english for an already generated mission. As I had this line into my DGenMod.ini, my mission's briefings where in English, so no problem.
The one I had was about the choice of the campaign into the selection screen: they were in russian (so, for example, no "* Imperial Japanese Navy Carrier Fighter", but "* Èñòðåáèòåëü ßïîíñêîãî Èìïåðàòîðñêîãî Ôëîòà (àâèàíîñåö)"). I guess it is linked with the fact that I could not generate some campaigns, like the Rabaul one's, when I modified some "xxxcampaign.dat" to "xxxcampaign_ru.dat", so the campaign's choice appear in English into my campaign selection screen. I haven't modified the others "xxxFMsgEN" to "xxxFMsgRu" for the other ones, but that trick worked yesterday for the "late Tokyo campaigns": they now appear in English into my campaign selection screen, and I can load them. So I guess it'll work too with Rabaul, Salomon, Guadalkanal etc... one's, that are actually appearing in english into my campaign selection screen, but don't generate. (actually, when I click on the button to generate them, it made the "click" sound, but nothing more).
Later today, I will change the other problematics "xxxFMsgEn" to "xxxFMsgRu" and see if it works like I guess, and I will repport it here so you know.