Add special case for one thousand in spanish

lib/numbers_and_words/strategies/figures_converter/languages/es.rb

@@ -11,18 +11,27 @@ def capacity_iteration
             words.push megs(capacity_words) unless capacity_words.empty?
 
             if 0 < @current_capacity
-              # eg 1000000 should be "un millon" not "uno millon"
+              # eg 1000000 should be "un millón" not "uno millón"
               #    501000 should be "quinientos un mil" not "quinientos uno mil"
-              # so we replace "uno" with "un" throughout
+              #    1000 should be "mil" not "uno mil"
+              # so we replace "uno" with "un" throughout or delete it if that is the case
 
-              capacity_words = capacity_words.map{|word|
-                word.gsub( @translations.ones(1), @translations.one )
-              }
+              capacity_words = capacity_words.map { |word|
+                word.gsub(@translations.ones(1), @translations.one) unless is_a_thousand? and is_a_one?
+              }.compact
             end
 
             words + capacity_words
           end
 
+          def is_a_one?
+            [translations.ones(1)] == words_in_capacity(@current_capacity)
+          end
+
+          def is_a_thousand?
+            FiguresArray::THOUSAND_CAPACITY == @current_capacity
+          end
+
           def hundreds
             super({:is_hundred => (figures[1,2] == [0,1] && simple_number_to_words.empty?)})
           end