glossaries package FAQ
As from version 4.12, the language support has been split off into separate independently-maintained modules. For example, glossaries-french. The required language module needs to be installed in addition to installing/updating glossaries. Note that not all languages are supported. See the section “Creating a New Language Module” in the user manual for guidance if you want to create a new language module.
Alternative link: https://www.dickimaw-books.com/faq.php?itemlabel=notranslation