In the new study, two experiments using the well-known "trolley dilemma" tested the hypothesis that when faced with moral choices in a foreign language, people are more likely to respond with a utilitarian approach that is less emotional.
The researchers collected data from people in the U.S., Spain, Korea, France and Israel. Across all populations, more participants selected the utilitarian choice -- to save five by killing one -- when the dilemmas were presented in the foreign language than when they did the problem in their native tongue.
The article:
http://www.sciencedaily.com/releases/2014/04/140428120659.htm
The publication:
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0094842
Makes sense. The more fluent you are the less "foreign" the language is to you.
This fits in with the recent post about the need to first 'believe' something before rejecting it (can't find it). The better you get in a (foreign) language the less you consciously reflect on it's content and thus the less chance to reject it you get.