I’m certain it was in English.

As for the box art….friend who watched it with me, says what he recalls is it had a simple drawing of a road leading up to a house. It had a car going up the road to the house. Believes the bg was red and the house and car were black.

When the reveal twist happened midway, I believe the couple were driving their car which broke down. They stopped another car on the quiet country road and carjacked the good samaritan couple. They took them into the woods, killed them, and then continued in their car. The female victim survived, shortcutted thru the country and caught up at the gas station. Its foggy after that as to what happened.