def add_logo(self, text, width, height, lang=None):
        """
        Binds a logo to the given language
        :type text: str
        :type width: str
        :type height: str
        :type lang: Optional[str]

        :param text: Path to logo
        :param width: width of logo
        :param height: height of logo
        :param lang: language
        """

        logo_entry ={"text": text, "width": width, "height": height}
        if lang:
            logo_entry["lang"] = lang
        self._logos.append(logo_entry)
Binds a logo to the given language
        :type text: str
        :type width: str
        :type height: str
        :type lang: Optional[str]

        :param text: Path to logo
        :param width: width of logo
        :param height: height of logo
        :param lang: language