score:6
The English version has the following questions for this case:
Are you now, a citizen or national of any other country? Have you ever been a citizen or national of any other country?
No mention about residency, so unless the applicant has dual-citizenship, the answer should be "No" to both. The only place where you put the place of residence is in the contact information.
I live outside of my home country, too, and have used ESTA a couple times when traveling from here without problems.