To do this, go to the Localisations page in Enate Builder, select 'Custom Card' from the list and choose your desired language from the drop-down. To add your translations, double click on the box in the row of your chosen language column to open the translate pop-up and enter your translations.
When users log into Work Manager in that language, they will now see the translated Custom Card name when displaying a Work Item with that Custom Card.
Note that Custom Card descriptions do not yet appear in Work Manager, but they will do as part of a future release.
See this video to find out more about how to create Custom Cards:
And you can find even more information about Custom Cards in this dedicated article: