title: Can I get a list of available locale translations from my Chrome extension?
body: <p>Is there a way to retrieve from within my Google Chrome extension the list of all available translations?</p>
  
  <p>For instance, my app may contain the following folders:</p>
  
  <pre><code>_locales\en\messages.json
  _locales\fr\messages.json
  _locales\es\messages.json
  </code></pre>
  
  <p>Is there a way to know that it's <code>en</code>, <code>fr</code>, and <code>es</code> from within the extension itself?</p>
  
  <p>And a second question, is there any way to parse a specific <code>messages.json</code> file as the JSON data? I mean a little bit more capabilities than what's provided by <code>chrome.i18n.getMessage()</code>.</p>