title: didFailProvisionalNavigation error not localized
body: <p>I have a localized app. I use <code>WKWebView</code> and also make some network requests. All the app localization works as expected. But errors from <code>webView:didFailProvisionalNavigation:withError</code> are always in English. I haven't found any information about any bugs on <code>WebKit</code> or <code>Error</code> side, but localizedDescription is always in English. Why?</p>
  
  <p>Steps to reproduce:</p>
  
  <ol>
  <li>Just create WKWebView and assign its delegate to self;</li>
  <li>handle <code>webView:didFailProvisionalNavigation:withError</code>;</li>
  <li>Enable airplane mode, switch off wifi and try to load any page;</li>
  <li>You'll get connection error with wrong localization.</li>
  </ol>