Case C-46/17: Judgment of the Court (Sixth Chamber) of 28 February 2018 (request for a preliminary ruling from the Landesarbeitsgericht Bremen — Germany) — Hubertus John v Freie Hansestadt Bremen (Reference for a preliminary ruling — Social policy — Directive 1999/70/EC — Framework Agreement on fixed-term work concluded by ETUC, UNICE and CEEP — Successive fixed-term employment contracts — Clause 5(1) — Measures aimed at preventing the misuse of fixed-term contracts — Directive 2000/78/EC — Article 6(1) — Prohibition of discrimination on the ground of age — National legislation authorising the postponement of the end of the contract of employment fixed at the normal retirement age simply because that the worker qualified for a retirement pension)