Adds a sample for polymer internationalization/localization

samples/polymer_intl/README.md

Index: samples/polymer_intl/README.md
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+## A polymer component with localized messages
+
+A simple demonstration of internationalization/localization
+with Polymer components. It 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
+
+### Files
+
+* `pubspec.yaml`: the Pub dependencies for this application.
+
+* `build.dart`: creates the deployed Polymer application.
+
+* `web/polymer_intl.html`: the main application file. This imports and
+uses the `<localized-example>` custom element.
+
+* `web/polymer_intl.css`: Styles for the application.
+
+* `web/localized.html`, `web/localized.dart`: Defines the 
+`<localized-example>` custom element.
+
+* `intl_messages.json`, `translation_fr.json`, and `translation_pt.json`:
+Data files used in the translation process.
+
+* `messages_all.dart`, `messages_fr.dart`, and `messages_pt.dart`:
+Generated code defining Dart libraries with the translated messages.