title: get_current_language_bidi not working as expected
body: <p>I have added <code>django.template.context_processors.i18n</code> to context_processors,
  I have added <code>django.middleware.locale.LocaleMiddleware</code> to middleware_classes, and I'm nearly certain this is unrelated, but just in case I also added <code>url(r'^i18n/', include('django.conf.urls.i18n'))</code> to urlpatterns.</p>
  
  <p>I created a .po file successfully, compiled a .mo file, and the translations (where there are strings to be translated) are loading fine.</p>
  
  <p>However, when I run the following code:</p>
  
  <pre><code>{% extends "page.html" %}
  {% load i18n %}
  {% get_current_language as LANGUAGE_CODE %}
  {% get_current_language_bidi as LANGUAGE_BIDI %}
  {% block title %}{% trans "translation test" %}{% endblock %}
  {% block page_main_content %}
  &lt;div id="some-text"&gt;
    &lt;ul&gt;
        &lt;li&gt;The current language is &lt;b&gt;{{ LANGUAGE_CODE }}&lt;/b&gt;&lt;/li&gt;
        {% if LANGUAGE_BIDI %}
          &lt;li&gt;The current language is bidirectional&lt;/li&gt;
        {% else %}
          &lt;li&gt;The current language is &lt;b&gt;not&lt;/b&gt; bidirectional&lt;/li&gt;
        {% endif %}
    &lt;/ul&gt;
  &lt;/div&gt;
  {% endblock %}
  </code></pre>
  
  <p>What I get is:</p>
  
  <blockquote>
    <ul>
    <li>The current language is he_IL  </li>
    <li>The current language is <strong>not</strong>    bidirectional</li>
    </ul>
  </blockquote>
  
  <p>I would assume I'm importing something incorrectly or have misconfigured settings, but <code>get_current_language</code> is (clearly) working fine. So why is django incorrectly returning False for <code>get_current_language_bidi</code>? </p>