title: Display non ascii (Japanese) characters in pandas plot legend
body: <p>If I do this:</p>
  
  <pre><code>import pandas as pd
  pd.DataFrame( data=nr.random( (2,2) ), columns=[u'é',u'日本'] ).plot()
  </code></pre>
  
  <p>Result:</p>
  
  <p><img src="https://i.stack.imgur.com/cDbH2.png" alt="enter image description here"></p>
  
  <p>So <code>é</code> shows up, but not <code>日本</code>. After googling a bit, I found this <a href="http://d.hatena.ne.jp/knaka20blue/20101118/1290070225" rel="nofollow noreferrer">page</a> which seems to provide a solution for <code>matplotlib</code>. I downloaded the font file <a href="http://ipafont.ipa.go.jp/ipafont/download.html#en" rel="nofollow noreferrer">here</a> and got it to work with <code>matplotlib</code>: </p>
  
  <pre><code>import matplotlib.font_manager as fm
  prop = fm.FontProperties(fname='/Users/user/Downloads/IPAfont00303/ipag.ttf')
  plt.plot( np.arange(10), np.arange(10), label=u'日本' )
  plt.legend( prop=prop )
  </code></pre>
  
  <p>Result:</p>
  
  <p><img src="https://i.stack.imgur.com/m7i8m.png" alt="enter image description here"></p>
  
  <p>Then I tried to apply the same solution to <code>pandas</code>:</p>
  
  <pre><code>import matplotlib.font_manager as fm
  prop = fm.FontProperties(fname='/Users/user/Downloads/IPAfont00303/ipag.ttf')
  df0.plot( prop=prop )
  </code></pre>
  
  <p>Result:</p>
  
  <pre><code>TypeError: There is no line property "prop"
  </code></pre>
  
  <p>I understand the error message, but I don't know how I can get pandas to use <code>prop=prop</code>. Any help is welcome.</p>