Case C-645/11: Judgment of the Court (Third Chamber) of 11 April 2013 (reference for a preliminary ruling from the Bundesgerichtshof — Germany) — Land Berlin v Ellen Mirjam Sapir, Michael J. Busse, Mirjam M. Birgansky, Gideon Rumney, Benjamin Ben-Zadok, Hedda Brown (Regulation (EC) No 44/2001 — Articles 1(1) and 6(1) — Concept of ‘civil and commercial matters’ — Undue payment made by a State entity — Claim for recovery of that payment in legal proceedings — Determination of the court having jurisdiction in the case where claims are connected — Close connection between the claims — Defendant domiciled in a non-member State)