Case C-317/18: Judgment of the Court (Eighth Chamber) of 13 June 2019 (request for a preliminary ruling from the Tribunal Judicial da Comarca de Faro) — Cátia Correia Moreira v Município de Portimão (Reference for a preliminary ruling — Directive 2001/23/EC — Transfers of undertakings — Safeguarding of employees’ rights — Concept of ‘worker’ — Substantial change in working conditions to the detriment of the employee)