title: d3.locale() in d3.js v4, localization
body: <p>I'm using d3.js for charts and now would like to update it to v4. </p>
  
  <p>It was found that <code>d3.locale()</code> doesn't work anymore since the translation all date formats are on different language. </p>
  
  <p>How can I fix that? I'm digging the forum, but for v4 I didn't really find it. </p>