More languages problems

Unfortunately I cannot use this plugin for 2 languages.

Using the polylang plugin i’ve two languages: English and Dutch
The main language works great, but translate an product it freezes the product data “smart grouped”. I think it’s a bug or i missed the dutch translation.

I can help with a translation if necessary. I have already translated the trink: https://translate.ww.wp.xz.cn/locale/nl/default/wp-plugins/wpc-grouped-product/