I got answer that Modders cannot do that.
Answer from Vøytek in my original Promods offtopic before the case was over to this SCS forum:
https://www.promods.net/viewtopic.php?p=182699#p182699
"Indeed. If it's a translated cargo name, then it's a SCS bug. Modders can't make their own strings that can be different depending on the game language chosen by the player.."
I have tested with a test profile that is vanilla SCS version and translated cargo name has the same name:
Edit: I have now posted picture again due to previous picture was just image link on imgur. Now it should be more correct size.
The trick I found was on this website and involved just a edit on link:
https://thomas.vanhoutte.be/miniblog/im ... ail-trick/