Okay, let me explain. I have bilingual interface (I’m using qTranslateX plugin for that) and I need to create bilingual tags and categories first (with one slug and two types of writing) and after that I can add existing bilingual tags and categories to my images. Also I need to say that there is no link in a sidebar to a page where you can create product tags and I picked the URL by myself (http://mydomain.com/wp-admin/edit-tags.php?taxonomy=product_tag). So when I’m trying to add existing tags and categories to my images I can see only list of categories but no tags:

And when I’m trying to add tags in quick edit I can’t do that. For example here I’m trying to add tag ‘WWII veterans’ which I already have, but you can see, that system says ‘0’:

What you guys think?
Thanks for any help.