New issue by eoli3n on void-packages repository

https://github.com/void-linux/void-packages/issues/27255

Description:
### System

* xuname:  
  Void 5.9.14_1 x86_64 GenuineIntel/VM uptodate rrrmFFF
* package:  
  firefox-i18n-fr-84.0_1

### Expected behavior
firefox defaulty configured in french

### Actual behavior
firefox starts in english, and french is not disponible in languages menu.

### Steps to reproduce the behavior
just install the package.