Add missing description for togglePerspective key

src/main/resources/assets/flansmod/lang/en_us.lang

@@ -1,6 +1,6 @@
 key.flansmod.category=Flan's Mod
 key.pitchDown.desc=Pitch down
-key.vehicleMenu.desc=Vehicle Menu
+key.vehicleMenu.desc=Vehicle menu
 key.dropBomb.desc=Drop bomb
 key.fireVehicleGuns.desc=Fire vehicle guns
 key.switchControlMode.desc=Switch control mode
@@ -15,6 +15,7 @@ key.switchMovementMode.desc=Switch vehicle movement mode
 key.lookAtGun.desc=Look at gun
 key.debug.desc=Debug
 key.reloadModels.desc=Reload models
+key.toggleCameraPerspective.desc=Toggle camera perspective
 itemGroup.tabFlan0=Flan's Mod Guns
 itemGroup.tabFlan1=Flan's Mod Vehicles
 itemGroup.tabFlan2=Flan's Mod Parts