Slider doesn't work with japanese characters in urls

Hi there,

Just a heads up that the slider doesn’t work with links containing japanese characters.

http://sitename.co.jp/wordpress/%e6%a5%ad%e7%a8%ae%e3%81%a7%e6%8e%a2%e3%81%99/

(Not a live link, just to show how japanese characters are encoded)

Here is the error I get when trying to save the images:

Warning: sprintf(): Too few arguments in sitename.co.jp/wordpress/wp-content/plugins/simple-responsive-slider/classes/options.php on line 486

Warning: sprintf(): Too few arguments in sitename.co.jp/wordpress/wp-content/plugins/simple-responsive-slider/classes/options.php on line 486

https://ww.wp.xz.cn/plugins/simple-responsive-slider/