New language adding error('Unknown language code si.')

Hello Guys 

I added new language to django . language called Sinhala. My code is look like this.

On settings page 

LANGUAGE_CODE = 'en'

LANGUAGES = [

    ('si', _('Sinhala')),

    ('en', _('English')),

]

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True

LOCALE_PATHS = (

    os.path.join(os.path.dirname(__file__), "../locale"),

)

On locale folder 

__init__.py

LANG_INFO = {

    'si': {

        'bidi': False,

        'code': 'si',

        'name': 'Sinhala',

        'name_local': 'Sinhala',

    },

}

I ran this command after that 

manage.py makemessages -l si  manage.py compilemessages

When i goes to admin URL with sinhala language its working fine i try get all supported language give this error 

<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 %}          {% get_available_languages as LANGUAGES %}          {% get_language_info_list for LANGUAGES as languages %}          {% for language in languages %}              <option value="{{ language.code }}"{% if language.code == LANGUAGE_CODE %} selected{% endif %}>                  {{ language.name_local }} ({{ language.code }})              </option>          {% endfor %}      </select>      <input type="submit" value="Go" />  </form>

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