Judgment of the Court (First Chamber) of 16 December 2004 in Case 520/03 (reference for a preliminary ruling from the Tribunal Superior de Justicia de la Comunidad Valenciana): José Vicente Olaso Valero v Fondo de Garantía Salarial (Fogasa) (Social policy — Protection of workers in the event of the insolvency of their employer — Directive 80/987/EEC — Scope — Definition of ‘claims’ — Definition of ‘pay’ — Compensation payable in the event of unfair dismissal)