[Fisneaky]

Look in "#:\Program Files\Ubisoft\IL-2 Sturmovik 1946\i18n"

netmessages_fr.properties

hud_msg_fr.properties

backup your netmessages.properties

and hud_msg.properties

and rename the _fr.properties files

Other "_ru" files in "#:\Program Files\Ubisoft\IL-2 Sturmovik 1946\files\i18n"
Probably have to edit these in Notepad unless anyone knows where the _fr files are.