Case T-195/18: Judgment of the General Court of 13 May 2020 — Talanton v Commission (Arbitration clause — Seventh framework programme for research, technological development and demonstration activities (2007-2013) — Perform Contract — Eligible costs — Repayment in part of the sums paid — Abuse of contractual rights — Principle of good faith — Legitimate expectations — Burden of proof — Counterclaim)