Merged r11637 from trunk to 2.3-stable (#13354)

PDF: fix incompatible character encodings: UTF-8 and ASCII-8BIT.

Contributed by Jun NAITOH.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/2.3-stable@11639 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/helpers/issues_helper.rb

@@ -353,7 +353,10 @@ module IssuesHelper
     association = Issue.reflect_on_association(field.to_sym)
     if association
       record = association.class_name.constantize.find_by_id(id)
-      return record.name if record
+      if record
+        record.name.force_encoding('UTF-8') if record.name.respond_to?(:force_encoding)
+        return record.name
+      end
     end
   end