Case C-102/18: Judgment of the Court (Sixth Chamber) of 17 January 2019 (request for a preliminary ruling from the Oberlandesgericht Köln — Germany) — Proceedings brought by Klaus Manuel Maria Brisch (Reference for a preliminary ruling — Judicial cooperation in civil matters — Regulation (EU) No 650/2012 — Article 65(2) — European Certificate of Succession — Application for a certificate — Implementing Regulation (EU) No 1329/2014 — Mandatory or optional nature of the form established by Article 1(4) of Implementing Regulation No 1329/2014)