Fake nails and women’s shoes were flying as a bloody claw fight erupted at a Dorchester salon after one primping patron allegedly screamed at a woman bantering in Spanish, “Speak English! This is America!” . Just minutes after the melee broke out at Kathy’s Nail Design at 261 Bowdoin St., it escalated to the point of a 911 call. A cop who arrived to break the fracas up got angry red scratches on his neck and arm for his trouble. They were left by a woman who’d just spent $40 for French manicure nail tips, said the shop’s owner, David...