That's not what I meant. I meant that they're not a property of the pseudo-release, but global values. They're found on the involved artist's alias tab.
If they were specifically tied to a pseudo-release, their locale could be inferred from that.
The other elent to my point is that when you configure Picard to use English artist names, that gets applied to ACs by using the component artists' aliases. That leaves join phrases untranslated. Enabling artist credit aliases would allow for that to be set up properly.