Case C-391/20: Judgment of the Court (Grand Chamber) of 7 September 2022 (request for a preliminary ruling from the Latvijas Republikas Satversmes tiesa — Latvia) — proceedings brought by Boriss Cilevičs and Others (Reference for a preliminary ruling — Article 49 TFEU — Freedom of establishment — Restriction — Justification — The organisation of education systems — Institutions of higher education — Obligation to provide courses of study in the official language of the Member State concerned — Article 4(2) TEU — National identity of a Member State — Defence and promotion of the official language of a Member State — Principle of proportionality)