Cannot change language for user interface on Haiku

[Begasus]

Environment

• TeXstudio: 4.8.6
• Qt: Using Qt Version 6.8.2, compiled with Qt 6.8.2 R (users still running builds from Qt 6.7.2)
• OS: Haiku R1B5 (nightly also)
• TeX distribution: texlive 2025

Expected behavior

Gettiing a list of installed languages when selecting this in Preferences/general

Actual behavior

Only option is "default" or "en (English)"

How to reproduce

Install the package provided by our package manager on Haiku.

[Begasus]

For the record, language files are installed to CMAKE_INSTALL_DATADIR/texstudio