Case C-541/18: Judgment of the Court (Fifth Chamber) of 12 September 2019 (request for a preliminary ruling from the Bundesgerichtshof — Germany) — AS v Deutsches Patent- und Markenamt (Reference for a preliminary ruling – Trade marks – Directive 2008/95/EC – Article 3(1)(b) – Distinctive character – Criteria for assessment – Sign comprising a hashtag)