I seriously doubt ANY researcher, regardless of field, would be crazy enough to publish results they considered to be important in any other language but English.
I am sure there are a few journals around where you are allowed to publish articles in other languages, but that is generally "internal" journals (proceedings of various national academies etc) that are meant to show journalists, politicians etc what scientists are doing with their funding.
Before the fall of the Berlin wall there were still important papers being published in Russian and sometimes it took a few months before they were translated to English, but that was for political reasons; the scientist themselves would have preferred to publish in English.