use utf-8 encoding option for nokogiri to allow special characters

Author: WesKetch

lib/mds/services/base.rb

@@ -41,7 +41,7 @@ def build_response_instance(xml_response)
       end
 
       def xml_builder
-        Nokogiri::XML::Builder.new do |xml|
+        Nokogiri::XML::Builder.new(:encoding => 'UTF-8') do |xml|
           xml.send(self.class.xml_root, 'xml:lang' => 'en-US') do
             xml.ClientCode @client_code
             xml.ClientSignature @client_signature