Redmine uses Ruby on Rails FPDF plugin to export PDF, which has problems treating
non-ASCII characters because the version of plugin doesn't support unicode.
Now rfpdf trunk supports unicode. This project is dedicated to integration of rfpdf trunk into Redmine.
The goal is:An advice of skilled people will be very appreciated, because I myself am not a programmer.
It will be Redmine trunk itself, but change under vendor/plugin/rfpdf tree and so on.
How to use tree, font issues, and so on.