Well my response probably isn't the one you wanted, but I just checked a known 2 channel file (albeit both are English, but scenario is the same), and couldn't see any way of selecting a specific audio steam. The Info window shows 2 channels, but no way of selecting one or the other.
... since VisualHub is a dead project, I don't see a way that this will be fixed.
Sorry... I told you this probably wasn't the answer you wanted.
Why not try Handbrake 0.9.3? I know you can select audio tracks in it. (Edit: as NJuul just said... damn, not fast enough!)
HTH