Maybe there's a relationship to the unresolved Mac bug
https://sourceforge.net/p/gretl/bugs/221/ - maybe you could even help
investigating that thing some more, if you have the time.
That's my doubt too. I'm going to uninstall/reinstall gretl and keep testing.

Definitevely, after, testing and testing this should be a (yet tenacious) Mac related bug.

I tested also on Windows 10 and it works fine so there's nothing wrong with the translation.

Best,

Artur