Hello !
I just created my first Trello Power-Up ( and hopefully it won't be the last ) !
It allows the user to translate whole boards, individual cards , labels and checklist items by using Deepl API ( it works with both free and PRO version ).
See it in action : youtube.com/watch?v=PS_tI1z5wGU&t=54s
A free 7 days trial is offered so you can test the Power-Up :) your feedback is very welcome to improve it so it suits all you needs
https://trello.com/power-ups/66061d99634c57e025d1cf26
Thanks in advance