Relegation-threatened Union Berlin have extended the contract with captain Christopher Trimmel ahead of the final Bundesliga matchday this weekend, the club said on Thursday. Trimmel has been with the team since 2014, but Union didn’t disclose any detail of the new deal. “I’ve been part of the Union family for a decade now and together we’ve achieved more than I could ever have dreamed of,” the player said. Men’s football director Oliver Ruhnert added: “Christopher has been an integral part of this club for many years and an identification figure for players and fans alike. We are delighted to…