Translates a text
        :param text:
            text to translate, the maximum size of the text being passed is 10,000 characters
        :param lang:
            The translation direction. for example: "en-ru"
            or target lang. for example, "ru"
        :param form:
            Possible values:
                FORMAT.PLAIN_TEXT - Text without markup (default value).
                FORMAT.HTML - Text in HTML format.
        :return: str[]

def translate(self, text: str, lang: str, form: FORMAT = FORMAT.PLAIN_TEXT):
        """
        Translates a text
        :param text:
            text to translate, the maximum size of the text being passed is 10,000 characters
        :param lang:
            The translation direction. for example: "en-ru"
            or target lang. for example, "ru"
        :param form:
            Possible values:
                FORMAT.PLAIN_TEXT - Text without markup (default value).
                FORMAT.HTML - Text in HTML format.
        :return: str[]
        """
        encodedtext = urllib.parse.quote(text)
        args = "&text=" + encodedtext + "&lang=" + lang + "&format="
        if form == FORMAT.PLAIN_TEXT:
            args += "plain"
        else:
            args += "html"

        r = self.yandex_translate_request("translate", args)
        self.handle_errors(r)

        return r.json()["text"]