Insurgents / Security using wrong voice

This is a very glaring issue and needs to not be allowed/corrected. Very annoying when you hear enemy using the wrong voice near you and you assume it's a teammate. When you hear voice like this it's part of identifying FOF and it's very frustrating to hear what you thought was a teammate behind you only to get shot by them a second later. Or vice versa. Your teammate gets shot and has the wrong voice and you turn around only to see your teammate behind you.

Wrong voice, or is it because some lines aren't in english for security/vice versa?