PDF: use DejaVuSans fonts in Vietnamese (#8566).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@6035 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/export/pdf.rb

@@ -40,6 +40,11 @@ module Redmine
             @ic = Iconv.new(pdf_encoding, 'UTF-8')
           end
           super('P', 'mm', 'A4', (pdf_encoding == 'UTF-8'), pdf_encoding)
+          case current_language.to_s.downcase
+          when 'vi'
+            @font_for_content = 'DejaVuSans'
+            @font_for_footer  = 'DejaVuSans'
+          else
             case pdf_encoding
             when 'UTF-8'
               @font_for_content = 'FreeSans'
@@ -68,6 +73,7 @@ module Redmine
               @font_for_content = 'Arial'
               @font_for_footer  = 'Helvetica'
             end
+          end
           SetCreator(Redmine::Info.app_name)
           SetFont(@font_for_content)
         end