Case C-177/12: Judgment of the Court (Fifth Chamber) of 24 October 2013 (request for a preliminary ruling from the Cour de cassation du Grand-Duché de Luxembourg (Luxembourg)) — Caisse nationale des prestations familiales v Salim Lachheb, Nadia Lachheb (Request for a preliminary ruling — Social security — Regulation (EEC) No 1408/71 — Family benefit — Child bonus — National regulation providing for a benefit to be granted by way of an automatic tax rebate for children — Non-cumulation of family benefits)