Hello I need some help I took my old light switch off and went to reconnect a new light switch, both are two switches however the old light had on the back just a common L1 and L2. The black/red was in common, blue l2 and red and yellow l1. But with the new switch it has common 1 - l11,l12 and common 2 - L21 and L22 . Can someone advise where to put the wires, I've tried loads now and still not right, thanks!