Case C-418/18 P: Judgment of the Court (Grand Chamber) of 19 December 2019 — Patrick Grégor Puppinck and Others v Republic of Poland, European Commission, European Parliament, Council of the European Union, European Citizens’ Initiative One of Us (Appeal — Institutional law — Citizens’ initiative ‘One of us’ — Communication from the European Commission setting out its conclusions and the reasons for not taking the action requested in the citizens’ initiative)