Case T-723/18: Judgment of the General Court of 3 March 2021 — Barata v Parliament (Civil service — Officials — Promotion — Certification procedure — Exclusion of the applicant from the final list of officials entitled to take part in the training programme — Article 45a of the Staff Regulations — Action for annulment — Communication by registered letter — Article 26 of the Staff Regulations — Registered letter not collected by the person to whom it was addressed — Starting point of the period prescribed for instituting proceedings — Admissibility — Obligation to state reasons — Right to be heard — Principle of sound administration — Proportionality — Rules on the use of languages)