Language "Use the system default" is no longer working, falls back to English (Fedora, KDE)

[magicgoose]

• I have checked the FAQ for answers.
• I have checked the Changelog that the issue is not already fixed.
• I believe this issue is a bug, and not a general technical issue, question or feature requests that can be discussed on the forum.

Describe the bug
Language "Use the system default" is no longer working as expected - instead, Strawberry uses English ignoring the system-wide language.

To Reproduce
Use Fedora KDE Spin.
Set language to non-English, for example Dutch (= Nederlands).
Install Strawberry Fedora package.
Make sure Strawberry Language = "Use the system default", restart if needed.

Expected behavior
Strawberry to use system language. (this worked before the latest few weeks)

Screenshots:

System Information:

• Operating system: Fedora Linux 40
• Strawberry Version: 1.1.3

Additional context

• Graphics Platform: Wayland
• Qt Version: 6.7.2
• KDE Plasma Version: 6.1.5
• KDE Frameworks Version: 6.6.0
• Kernel Version: 6.10.11-200.fc40.x86_64 (64-bit)

Most other applications (which are translated to begin with) are still translated on this system, everything indicates that something specific to Strawberry has recently happened.

[magicgoose]

I have checked the Changelog that the issue is not already fixed

from ChangeLog/Unreleased:

• Require Qt 6.4 or higher and drop support for Qt 5.
• Use Qt stringliterals.

could any of this possibly constitute a fix? I'm not sure

[jonaski]

I renamed all the .po files when I merged translations to Crowdin, that probably has something to do with it.

[jonaski]

What is LC_MESSAGES set to?
Check with locale | grep LC_MESSAGES

[jonaski]

Is suspect this is a Qt bug (https://bugreports.qt.io/browse/QTBUG-129434), I see on Windows that it returns "en_US" before the language set as the display language, I think the order of the languages are wrong, since strawberry only uses the first.
I don't know if it's a good idea parse and try all.

[magicgoose]

What is LC_MESSAGES set to? Check with locale | grep LC_MESSAGES

~> locale | grep LC_MESSAGES
LC_MESSAGES="nl_NL.UTF-8"

[fvalenduc]

I have gentoo and I have the same problem since strawberry-1.1.2. LC_MESSAGES is set to fr_BE.utf8

[jonaski]

Please test with Qt 6.8.0 and check if the issue is gone.

[fvalenduc]

I have tested strawberry 1.2.0 and qt 6.8.0 in Archlinux and the problem still occurs.