Index: lib/redmine/export/pdf.rb
===================================================================
--- lib/redmine/export/pdf.rb	(revision 19432)
+++ lib/redmine/export/pdf.rb	(working copy)
@@ -48,10 +48,11 @@
         end
 
         def SetFontStyle(style, size)
-          set_font(@font_for_content, style, size)
+          set_font(@font_for_content, +style, size)
         end
 
         def SetFont(family, style='', size=0, fontfile='')
+          style = +style
           # FreeSerif Bold Thai font has problem.
           style.delete!('B') if family.to_s.casecmp('freeserif') == 0
           # DejaVuSans Italic Arabic and Persian font has problem.
Index: test/functional/issues_controller_test.rb
===================================================================
--- test/functional/issues_controller_test.rb	(revision 19432)
+++ test/functional/issues_controller_test.rb	(working copy)
@@ -1074,7 +1074,7 @@
   end
 
   def test_index_pdf
-    ["en", "zh", "zh-TW", "ja", "ko"].each do |lang|
+    ["en", "zh", "zh-TW", "ja", "ko", "ar"].each do |lang|
       with_settings :default_language => lang do
         get :index
         assert_response :success
@@ -2674,7 +2674,7 @@
 
   def test_export_to_pdf_with_utf8_u_fffd
     issue = Issue.generate!(:subject => "�")
-    ["en", "zh", "zh-TW", "ja", "ko"].each do |lang|
+    ["en", "zh", "zh-TW", "ja", "ko", "ar"].each do |lang|
       with_settings :default_language => lang do
         get(
           :show,