send charset information in response for wp csv

app/controllers/work_packages_controller.rb

@@ -232,8 +232,9 @@ class WorkPackagesController < ApplicationController
       end
       format.csv do
         serialized_work_packages = WorkPackage::Exporter.csv(work_packages, @project)
+        charset = "charset=#{l(:general_csv_encoding).downcase}"
 
-        send_data(serialized_work_packages, :type => 'text/csv; charset=utf-8; header=present',
+        send_data(serialized_work_packages, :type => "text/csv; #{charset}; header=present",
                                             :filename => 'export.csv')
       end
       format.pdf do

spec/controllers/work_packages_controller_spec.rb

@@ -188,7 +188,7 @@ describe WorkPackagesController do
                                                       .and_return(mock_csv)
 
             controller.should_receive(:send_data).with(mock_csv,
-                                                       :type => 'text/csv; header=present',
+                                                       :type => 'text/csv; charset=utf-8; header=present',
                                                        :filename => 'export.csv') do |*args|
               # We need to render something because otherwise
               # the controller will and he will not find a suitable template