Case T-355/18: Judgment of the General Court of 8 September 2021 — Spain v Commission (Rules on languages — Notices of open competition for the recruitment of administrators in the field of public health and food safety — Restriction of the choice of language 2 to four 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)