Opinion of Advocate General Kokott delivered on 4 April 2019.#Koton Mağazacilik Tekstil Sanayi ve Ticaret AŞ v European Union Intellectual Property Office.#Appeal — EU trade mark — Regulation (EC) No 207/2009 — Absolute grounds for invalidity — Article 52(1)(b) — Bad faith at the time that an application for a trade mark is filed.#Case C-104/18 P.