Case C-94/20: Judgment of the Court (Fifth Chamber) of 10 June 2021 (request for a preliminary ruling from the Landesgericht Linz — Austria) — Land Oberösterreich v KV (Reference for a preliminary ruling — Directive 2003/109/EC — Status of third-country nationals who are long-term residents — Article 11 — Right to equal treatment as regards social security, social assistance and social protection — Derogation from the principle of equal treatment in respect of social assistance and social protection — Concept of ‘core benefits’ — Directive 2000/43/EC — Principle of equal treatment between persons irrespective of racial or ethnic origin — Article 2 — Concept of discrimination — Article 21 of the Charter of Fundamental Rights of the European Union — Legislation of a Member State subjecting the grant of housing assistance to third-country nationals who are long-term residents to the condition that they provide proof, in a form specified by that legislation, that they have a basic command of the language of that Member State)