Description of the Bug:
There is a translation error in the handling crew menu. On the right, next to the number of available people, there is a text that says ‘Free’ in English. This is translated to ‘Gratis’ in Dutch. But that is wrong, since it means ‘For free’ or ‘Free of charge’.
I would suggest to change this to ‘Beschikbaar’ which means ‘Available’.
Steps to Reproduce:
In the game, click the ground crew button.
It was updated to ‘gratis’ over a year ago as the context of the word was missing it seems and translator went to for that option. But I’ve put in your suggestion to ‘beschikbaar’ in the localazy database and it is now waiting for review.