Link "add links" on "Languages" section is not working on new pages, it returns the message "An unkonwn error occured". It has been reported supposedly after deployment of version 1.31.0-wmf.8 (https://www.mediawiki.org/wiki/MediaWiki_1.31/Roadmap).
Checked on group 1 wikis ca.wiki, he.wiki, ca.wiktionary, en.wiktionary with any page of Special:NewPages. On Wiktionaries only with category namespace. On commons this happens to all categories not yet linked to any wikidata items.
Other wikis not included in group 1 are working fine.