title: Extend filter_horizontal in django admin
body: <p>I have django app (django 1.11) and I need to extend filter_horizontal. I mean, I need to near title also a date of event.</p>
  
  <p>Here is my first model, where is M2M to event:</p>
  
  <pre><code>class Product(models.Model):
      title = models.CharField(max_length=500)
      events = models.ManyToManyField('events.Event', related_name="products", blank=True)
  </code></pre>
  
  <p>admin.py, and here I would like to have event title and date of event (event_title - event_date). Is it possible?</p>
  
  <pre><code>class ProductAdmin(TranslationAdmin):
      list_display = ('title',)
      filter_horizontal = ('events',)
  </code></pre>
  
  <p>here is model of event:</p>
  
  <pre><code>class Event(models.Model):
      title = models.CharField(max_length=500)
      date = models.DateField()
  </code></pre>