Method createLanguageTab

source/ControlPanelDialog.cpp:1949–2077

void ControlPanelDialog::createLanguageTab() {
    languageTab = new QWidget(this);
    QVBoxLayout *layout = new QVBoxLayout(languageTab);
    
    // Add some spacing at the top
    layout->addSpacing(10);
    
    // Title and description
    QLabel *titleLabel = new QLabel(tr("Language Settings"), languageTab);
    titleLabel->setStyleSheet("font-size: 16px; font-weight: bold;");
    layout->addWidget(titleLabel);
    
    layout->addSpacing(10);
    
    // Use system language checkbox
    useSystemLanguageCheckbox = new QCheckBox(tr("Use System Language (Auto-detect)"), languageTab);
    layout->addWidget(useSystemLanguageCheckbox);
    
    QLabel *systemNote = new QLabel(tr("When enabled, SpeedyNote will automatically detect and use your system's language setting."), languageTab);
    systemNote->setWordWrap(true);
    systemNote->setStyleSheet("color: gray; font-size: 11px; margin-bottom: 15px;");
    layout->addWidget(systemNote);
    
    // Manual language selection
    QLabel *manualLabel = new QLabel(tr("Manual Language Override:"), languageTab);
    manualLabel->setStyleSheet("font-weight: bold;");
    layout->addWidget(manualLabel);
    
    // Read saved language settings once — used both for combo population (so
    // a saved-but-uninstalled language still appears) and for initial state.
    QSettings settings(QStringLiteral("SpeedyNote"), QStringLiteral("App"));
    const bool useSystemLang   = settings.value(QStringLiteral("useSystemLanguage"), true).toBool();
    const QString overrideLang = settings.value(QStringLiteral("languageOverride"),
                                                QStringLiteral("en")).toString();

    languageCombo = new QComboBox(languageTab);
    for (const auto& lang : discoverAvailableLanguages(overrideLang)) {
        languageCombo->addItem(lang.displayName, lang.code);
        if (!lang.installed) {
            // Grey out the "not installed" entry but still allow selection so the
            // user can see their saved choice and can change it.
            const int idx = languageCombo->count() - 1;
            languageCombo->setItemData(idx, QColor(Qt::gray), Qt::ForegroundRole);
        }
    }
    useSystemLanguageCheckbox->setChecked(useSystemLang);
    languageCombo->setEnabled(!useSystemLang);
    const int savedIdx = languageCombo->findData(overrideLang);
    if (savedIdx >= 0) languageCombo->setCurrentIndex(savedIdx);
    layout->addWidget(languageCombo);
    
    QLabel *manualNote = new QLabel(tr("Select a specific language to override the system setting. Changes take effect after restarting the application."), languageTab);
    manualNote->setWordWrap(true);
    manualNote->setStyleSheet("color: gray; font-size: 11px; margin-bottom: 15px;");
    layout->addWidget(manualNote);
    
    // Current language status
    QLabel *statusLabel = new QLabel(tr("Current Language Status:"), languageTab);