Joined Cases C-776/19 to C-782/19: Judgment of the Court (First Chamber) of 10 June 2021 (requests for a preliminary ruling from the Tribunal de grande instance de Paris — France) — VB, WA (C-776/19), XZ, YY (C-777/19), ZX (C-778/19), DY, EX (C-781/19) v BNP Paribas Personal Finance SA and AV (C-779/19), BW, CX (C-780/19), FA (C-782/19) v BNP Paribas Personal Finance SA, Procureur de la République (Reference for a preliminary ruling — Consumer protection — Directive 93/13/EEC — Unfair terms in consumer contracts — Mortgage loan agreements denominated in a foreign currency (Swiss francs) — Limitation — Article 4(2) — Main subject matter of the contract — Terms exposing the borrower to a foreign exchange risk — Requirements of intelligibility and transparency — Burden of proof — Article 3(1) — Significant imbalance — Article 5 — Contractual term that is in plain, intelligible language — Principle of effectiveness)