Update font from Preferences

def update_font(self):
        """Update font from Preferences"""
        color_scheme = self.get_color_scheme()
        font = self.get_plugin_font()
        rich_font = self.get_plugin_font(rich_text=True)

        self.set_plain_text_font(font, color_scheme=color_scheme)
        self.set_rich_text_font(rich_font)