I ask a similiar question to xeexee, this is what they say in email:
I cannot officially endorse any localizations because I would have no way to read and approve them myself (I am not very skilled in any languages besides English, lol). But fans do have my permission to release unofficial patches themselves for readers in their languages!
Well, I am not sure xeexee will be open to the steam page localization, but for volunteer translations, perhaps you can just help yourself. Xeexee announce Vol2's page today, so I come here with the hope of getting something new. Hope these information can help you.