Traslates the content of source file to destination language
    :param filename: file whose contents needs translation
    :param srcLang: name of language of input file
    :param destLang: name of language of desired language
    :param serverEndpoint: Tika server end point (Optional)
    :return: translated content

def from_file(filename, srcLang, destLang, serverEndpoint=ServerEndpoint):
    '''
    Traslates the content of source file to destination language
    :param filename: file whose contents needs translation
    :param srcLang: name of language of input file
    :param destLang: name of language of desired language
    :param serverEndpoint: Tika server end point (Optional)
    :return: translated content
    '''
    jsonOutput = doTranslate1(srcLang+':'+destLang, filename, serverEndpoint)
    return jsonOutput[1]