Joined Cases T-168/10 and T-572/10: Judgment of the General Court of 19 September 2012 — Commission v SEMEA and Commune of Millau (Arbitration clause — Grant contract concerning a local development plan consisting in the performance of work for the preparation and launching of a European local enterprise centre in Millau (France) — Repayment of part of the advance payments made — Admissibility of an action brought against a company established under French law removed from the companies register — Application of French law — Administrative contract — Recovery of sum overpaid — Time-bar — Enforceability of an arbitration clause — Assumption of debt — Incidental debts rule — Stipulation in favour of third party)