title: Register custom filter in django
body: <p>My filter is not being registered and not sure where it's getting tripped up. </p>
  
  <p>In test/templatetags</p>
  
  <pre><code>__init__.py
  test_tags.py
  </code></pre>
  
  <p>test_tags.py includes</p>
  
  <pre><code>from django import template
  
  register.filter('intcomma', intcomma)
  
  def intcomma(value):
      return value + 1
  </code></pre>
  
  <p>test/templates includes pdf_test.html with the following contents </p>
  
  <pre><code>{% load test_tags %} 
  &lt;ul&gt;
      &lt;li&gt;{{ value |intcomma |floatformat:"0"&lt;/li&gt;
  &lt;/ul&gt;
  </code></pre>
  
  <p>float format works fine but no luck on intcomma</p>