Case T-718/17: Judgment of the General Court of 2 June 2021 — Italy v Commission (Rules on languages — Notice of Open Competitions for the recruitment of administrators and assistants in the buildings sector — Knowledge of languages — Restriction of the choice of language 2 of the competitions to three languages — Regulation No 1 — Article 1d(1), Article 27 and Article 28(f) of the Staff Regulations — Discrimination based on language — Interests of the service — Proportionality)