Suggestions are provided by WikiTree+, which is a third party service provided out of the kindness of other WikiTree users.
Note, that the domain for WikiTree+ is wikitree.sdms.si. The si at the end indicates that it is a Slovenian registered web page. Therefore, it should not be unexpected that in the event that the web page is encountering service issues that the error messages could be in Slovenian. This could just as well be the case with any third party web pages hosted in other countries, as well.