Gui Font Problem with GIMP on Mac OS

Hello, I was asked about following GIMP-on-Mac-Problem: GIMP uses a ‘sans’ font for the GUI Elements. On this Mac, one of the first chosen Sans-Serif Fonts seem to be a Cyrilic Font, so the GUI is unusable.
Does anyone know how GIMP chooses the GUI font on Mac?

(I work with GIMP on kubuntu, I don’t know su much about Mac OS)

Thanks and regards,

Adriana