We might be missing some configuration variables in the team's development infrastructure, but Codex components sometimes appear as the "qqx" message key rather than using the current interface language as expected.
See http://commons.wiki.local.wmftest.net:8080/w/index.php?title=Special:ImportFile&clientUrl=http%3A%2F%2Fdev.wiki.local.wmftest.net%3A8080%2Fwiki%2FFile%3ACuteGoat.jpg&importSource=FileExporter&codex=1 which often but not always appears with qqx labels. During development, we've had to add the &uselang=en parameter to force Codex to render in natural language.
Code to review: https://gitlab.com/wmde/technical-wishes/docker-dev/-/merge_requests/115