Case T-804/19: Judgment of the General Court of 1 December 2021 — HC v Commission (Civil service — Recruitment — Notice of competition — Open competition EPSO/AD/363/18 — Decision not to admit the applicant to the next stage of the competition — Obligation to state reasons — Manifest error of assessment — Plea of illegality — Equal treatment — Proportionality — Right to be heard — Principle of sound administration — Language rules for the competition — Discrimination based on language — Liability)