Add Polish language

lib/hola.rb

@@ -1,3 +1,5 @@
+# encoding: UTF-8
+
 class Hola
   def self.hi(language)
     translator = Translator.new(language)

lib/hola/translator.rb

@@ -1,3 +1,5 @@
+# encoding: UTF-8
+
 class Hola::Translator
   def initialize(language = "english")
     @language = language
@@ -9,6 +11,8 @@ def hi
       "hola mundo"
     when "korean"
       "anyoung ha se yo"
+    when "polish"
+      "witaj świecie"
     else
       "hello world"
     end

test/test_hola.rb

@@ -1,3 +1,5 @@
+# encoding: UTF-8
+
 require 'test/unit'
 require 'hola'
 
@@ -13,4 +15,8 @@ def test_any_hello
   def test_spanish_hello
     assert_equal "hola mundo", Hola.hi("spanish")
   end
+
+  def test_polish_hello
+    assert_equal "witaj świecie", Hola.hi("polish")
+  end
 end