moves current_language to query_utils

lib/report/query_utils.rb

@@ -46,6 +46,10 @@ module Report::QueryUtils
     ActiveRecord::Base.connection.quote_string(str)
   end
 
+  def current_language
+    ::I18n.locale
+  end
+
   ##
   # Creates a SQL fragment representing a collection/array.
   #