Sorry, I have the Mac OS version.
But I added the line "LANGUAGE = English" in the config file:
/Users/Lebostein/Library/Application Support/Stelex Software/Eselmir/config.ini
and it works!
Other minor problem: savegame icons are empty...
Great. Another way is to edit the config.ini file that is stored inside the Eselmir.app (Right click on "Eselmir.app" file and select "Show Package Contents").
About the savegames icons, that happened when we switched from Visionaire 3.x to 4.x. We should correct it in a future update.
Thanks.