'ku' is the macrolanguage code for Kurdish that may hold the locales ckb, kmr, sdh (respectively: Central Kurdish / Sorani, Northern Kurdish / Kurmanji, Southern Kurdish) and they hold great differences. See https://en.wikipedia.org/wiki/Kurdish_language#Varieties.

Weblate raises this issues in https://translate.fedoraproject.org/projects/libuser/glossary/#alerts and points to the documetnation in https://docs.weblate.org/en/weblate-2026.7/admin/languages.html#ambiguous-language-codes-and-macrolanguages

Since po/ku.po is empty, such issue can be easily solved by removing po/ku.po file and suppressing ku locale from po/LINGUAS