[1.8.x] Updated indentation of example template in docs/topics/i18n/translation.txt.

.. code-block:: html+django

    {% load i18n %}

    <form action="{% url 'set_language' %}" method="post">

    {% csrf_token %}

    <form action="{% url 'set_language' %}" method="post">{% csrf_token %}

        <input name="next" type="hidden" value="{{ redirect_to }}" />

        <select name="language">

            {% get_current_language as LANGUAGE_CODE %}