The plugin is really great, just what I was looking for.
There's one problem though. Naming sub-categories in Russian causes an error when going to pages in those sub-categories:
"Catchable fatal error: Object of class WP_Error could not be converted to string in /usr/local/apache2/htdocsprod/romm/wordpress/wp-content/plugins/slick-doc-it/includes/di-functions.php on line 370"
What's interesting is that when you go to the sub-category itself, there's no error. Seems like it's an issue with breadcrumbs.
So, when the breadcrumb ends in Russian, there's no error. In my case breadcrumb looks like this when you go to a sub-category - "Wiki » Тест", where "Тест" is in Russian characters. And it works fine.
When there's supposed to be some Russian in the middle of the breadcrumb it breaks. For example if you go to a page in "Тест" sub-category, there's and error and an unfinished breadcrumb: "Wiki »" when it's supposed to look like "Wiki » Тест » Test".
Help would be much appreciated.