Alright Marco got it working for you. Download the OMEGU English folder from my link if you don't have it, and the install like this.
OpsMonsun_V705
OMv705_to_V720
OMv720_Patch5
OMEGU_v300
OMEGU_v300_Patch7
KiUB_English
Magnified Hud Dials for OM OMEGU_Medium
OMEGU_English
Fifi Compilation for OM+OMEGU (without Speech folder)
and you will have English speech.