The source project of this merge request has been removed.
Use QLocale instead of Qt::SystemLocaleShortDate
The latter was deprecated with Qt 5.15 [1], causing the build with that version to fail (because of -DQT_DISABLE_DEPRECATED_BEFORE=0x060000).
[1] d6d98f782aeb798649c2bf5f7744065b7e86c035 in qtbase.git