qt: Use C (English) locale

No translations so far make use of non-standard digits

src/qt/qt_main.cpp

@@ -138,6 +138,7 @@ int main(int argc, char* argv[]) {
     QApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::PassThrough);
 #endif
     QApplication app(argc, argv);
+    QLocale::setDefault(QLocale::C);
     qt_set_sequence_auto_mnemonic(false);
     Q_INIT_RESOURCE(qt_resources);
     Q_INIT_RESOURCE(qt_translations);