Translates contents of a file to desired language by auto detecting the source language
    :param filename: file whose contents needs translation
    :param destLang: name of the desired language for translation
    :param serverEndpoint: Tika server end point (Optional)
    :return:

def auto_from_file(filename, destLang, serverEndpoint=ServerEndpoint):
    '''
    Translates contents of a file to desired language by auto detecting the source language
    :param filename: file whose contents needs translation
    :param destLang: name of the desired language for translation
    :param serverEndpoint: Tika server end point (Optional)
    :return:
    '''
    jsonOutput = doTranslate1(destLang, filename, serverEndpoint)
    return jsonOutput[1]