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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def multilingual(request):
 """ Returns context variables containing information about available languages. """

    codes = sorted(get_language_code_list())
    return {'LANGUAGE_CODES': codes,
            'LANGUAGE_CODES_AND_NAMES': [(c, LANG_DICT.get(c, c)) for c in codes], 
            'DEFAULT_LANGUAGE_CODE': get_default_language_code(),
            'ADMIN_MEDIA_URL': settings.ADMIN_MEDIA_PREFIX}