Case C-158/07: Judgment of the Court (Grand Chamber) of 18 November 2008 (reference for a preliminary ruling from the Centrale Raad van Beroep — Netherlands) — Jacqueline Förster v Hoofddirectie van de Informatie Beheer Groep (Freedom of movement for persons — Student who is a national of one Member State and goes to another Member State to follow a training course — Student maintenance grant — Citizenship of the Union — Article 12 EC — Legal certainty)