For what additional refinements language field is used for?

Hi,

I’m using OJS 3x and I would like to know what the purpose of the Languages field (additional refinements) is.
If I already have the field Submission Language, why this other field?

I have several journal, in some this field appears to be filled and in others it does not. Is there somewhere I can enable or disable the field?

Regards,
Tarcisio Pereira.