IQPuzzle 1.2.5, about tab, the word "Übersetzungen" is not displayed correctly

IQPuzzle 1.2.5, from rapps, or from
https://web.archive.org/web/20211002221130/https://github.com/ElTh0r0/iqpuzzle/releases/download/v1.2.5/iQPuzzle-1.2.5-ReactOS_Installer.exe

Reproduction steps

• install ros with german localization
• install IQPuzzle and open its about dlg in main app. This is a QT5 app.
• Look just at the word "Übersetzungen"

Expected result
the word "Übersetzungen" should be drawn italic and unbold
xpsp3_ok.png

Observed result
the word "Übersetzungen" is drawn in some weird blurry style
0.4.14-RC-101-g065e47d.png
0.4.14-RC-101-g065e47d.log