Output the results obtained in text format.

    :return: str, html formatted output

def _output_text(complete_output, categories):
    """Output the results obtained in text format.

    :return: str, html formatted output
    """
    output = ""

    for result in complete_output:
        list_result = complete_output[result]
        if list_result:
            list_result_sorted = sorted(list_result,
                                        key=lambda x: list_result[x],
                                        reverse=True)
            output += "\n\n{0}:\n".format(result)
            for element in list_result_sorted:
                output += "\n{0} {1}".format(list_result[element], element)

    output += "\n--"

    return output