mistake in function extraTryFontsForFamily

\Qt5.1.0\qtbase\src\plugins\platforms\windows\qwindowsfontdatabase.cpp

static QStringList extraTryFontsForFamily(const QString& family)
{
    QStringList result;
    QFontDatabase db;
    if (!db.writingSystems(family).contains(QFontDatabase::Symbol)) {
        if (!tryFonts) {
            LANGID lid = GetUserDefaultLangID();
            switch (lid&0xff) {
            case LANG_CHINESE: // Chinese (Taiwan)
                if ( lid == 0x0804 ) // Taiwan
                    tryFonts = ch_TW_tryFonts; // !!!!!should be ch_CN_tryFonts
                else
                    tryFonts = ch_CN_tryFonts; // !!!!!should be ch_TW_tryFonts
                break;
            case LANG_JAPANESE:
                tryFonts = jp_tryFonts;
                break;
            case LANG_KOREAN:
                tryFonts = kr_tryFonts;
                break;
            default:
                tryFonts = other_tryFonts;
                break;
            }
        }
        QStringList fm = QFontDatabase().families();
        const char **tf = tryFonts;
        while (tf && *tf) {
            if (fm.contains(QLatin1String(*tf)))
                result << QLatin1String(*tf);
            ++tf;
        }
    }
    return result;
}