And I've found the point of this case: it was because of "inputMethodHints: "ImhNoPredictiveText" ". But why it adds english keyset to my virtual keyboard, I didn't catch it

You're welcome !

Good to know :)

Since we know now that it's working, please update the thread title prepending [solved] so other forum users may know a solution has been found :)

@SGaist OK. Thanks for the answer. I'll give a try.

Such as ColorDialog, how to switch the language of the dialog that are available in the Qt is as follows .
Page that was in reference

#include <QApplication> #include <QTranslator> #include <QLibraryInfo> int main(int argc, char *argv[]) { //1 : Get the language setting of the system QTranslator qtTranslator; qtTranslator.load("qt_" + QLocale::system().name(), QLibraryInfo::location(QLibraryInfo::TranslationsPath)); QApplication a(argc, argv); //2 : Installation of language setting a.installTranslator(&qtTranslator); return a.exec(); }