Case T-108/18: Judgment of the General Court of 24 February 2021 — Universität Koblenz-Landau v EACEA (Arbitration clause — Tempus IV Programmes — Grant agreements — Contractual nature of the dispute — Reclassification of the action — Eligible costs — Systemic and recurrent irregularities — Full repayment of amounts paid — Proportionality — Right to be heard — Obligation to state reasons — Article 41 of the Charter of Fundamental Rights)