title: Werkzeug raises BrokenFilesystemWarning
body: <p>I get the following error when I send form data to my Flask app.  It says it will use the UTF-8 encoding, but the locale is already UTF-8.  What does this error mean?</p>
  
  <pre class="lang-none prettyprint-override"><code>/home/.virtualenvs/project/local/lib/python2.7/site-packages/werkzeug/filesystem.py:63:
  BrokenFilesystemWarning: Detected a misconfigured UNIX filesystem:
  Will use UTF-8 as filesystem encoding instead of 'ANSI_X3.4-1968'
  </code></pre>
  
  <pre class="lang-none prettyprint-override"><code>$ locale
  LANG=en_US.utf8
  LANGUAGE=en_US.utf8
  LC_CTYPE="en_US.utf8"
  LC_NUMERIC="en_US.utf8"
  LC_TIME="en_US.utf8"
  LC_COLLATE="en_US.utf8"
  LC_MONETARY="en_US.utf8"
  LC_MESSAGES="en_US.utf8"
  LC_PAPER="en_US.utf8"
  LC_NAME="en_US.utf8"
  LC_ADDRESS="en_US.utf8"
  LC_TELEPHONE="en_US.utf8"
  LC_MEASUREMENT="en_US.utf8"
  LC_IDENTIFICATION="en_US.utf8"
  LC_ALL=en_US.utf8
  </code></pre>