Adds a sample for polymer internationalization/localization

samples/polymer_intl/web/localized.html

Index: samples/polymer_intl/web/localized.html
diff --git a/samples/polymer_intl/web/localized.html b/samples/polymer_intl/web/localized.html
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+<!--
+Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+for details. All rights reserved. Use of this source code is governed by a
+BSD-style license that can be found in the LICENSE file.
+-->
+<polymer-element name="localized-example">
+  <template>
+    <h1>Polymer Internationalized Messages Example</h1>
+    
+    <p>{{helloWorld}}</p>
+    
+    <select value="{{selectedLocale}}">
+      <option value="en_US">English</option>
+      <option value="fr">French</option>
+      <option value="pt">Portguese</option>
+    </select>
+  </template>
+  <script type="application/dart" src="localized.dart"></script>
+</polymer-element>