Override locale with QSystemLocale

[sedi]

Hi,

I need QString::localeAwareCompare to properly sort German names.
This works on my desktop.

Unfortunately my tablet seems to provide a wrong system locale.

I've tried

mainWin.setLocale(QLocale(QLocale::German,QLocale::Germany));

mainWin.setLocale(QLocale(QLocale::German,QLocale::Germany));

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as well as

QLocale::setDefault(QLocale(QLocale::German,QLocale::Germany));

QLocale::setDefault(QLocale(QLocale::German,QLocale::Germany));

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but "Z" is still less than "Ö" (When "Ö" shoud be between "O" and "P").

I've looked into QSystemLocale, but there are no setter methods (and the documentation
is vague, actually saying " only useful in very rare cases."), so I don't understand how I
can use this. I didn't find anything particularly helpful about this on web research or in this Forum.

Is there any way to override the system locale and force Qt into using
a specific locale?

How do I use QSystemLocale (if at all) to force Qt into German sorting?