Hi @Ibone, thanks you for reply.
This is more complicated.
There is no problem with Redmine itself, when I install it from Redmine 4.1.1 web page as clean installation. And when I import data with UTF-8 codepage there is no error. I can import issues from file.
Problem occur only when I install Redmine from Bitnami Stack. I checked versions 4.1.1-4 and 4.1.1-5. That is why I posted here, and not on https://www.redmine.org/issues
Both installations are in the same configurations, Bitnami Redmine and flat Redmine.