Case C-621/16 P: Judgment of the Court (Grand Chamber) of 26 March 2019 — European Commission v Italian Republic, Republic of Lithuania (Appeal — Rules on languages — Open competition for the recruitment of administrators — Notice of competition — Administrators (AD 5) — Administrators (AD 6) in the field of data protection — Knowledge of languages — Restriction of the choice of language 2 of the competitions to English, French and German — Language of communication with the European Personnel Selection Office (EPSO) — Regulation No 1 — Staff Regulations — Discrimination based on language — Justification — Interests of the service — Judicial review)