Added polymer internationalization sample

src/site/samples/polymer_intl/index.markdown

Index: src/site/samples/polymer_intl/index.markdown
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+---
+layout: default
+title: A Polymer Component with Localized Messages
+live_example_url: example/polymer_intl.html
+header:
+  css: ["/samples/samples.css"]
+---
+
+## {{ page.title }}
+
+A simple demonstration of internationalization/localization
+with Polymer components. The demo defines a Polymer component that lets you
+choose from a selection of locales and displays a message translated
+for the selected locale.
+
+The component is defined in `localized.html` and `localized.dart`, and the
+main entry point is `polymer_intl.html`.
+
+Read the
+[source](https://code.google.com/p/dart/source/browse/branches/bleeding_edge/dart/samples/polymer_intl).
+
+<iframe class="running-app-frame"
+        style="height:400px;width:100%;"
+        src="{{page.live_example_url}}">
+</iframe>
+
+See all [samples](/samples/).