Move i18n example to qttools

Move i18n example out of qtbase, into qttools. Improve by
- removing hard-coded .qm files and .qrc file. Instead, use
  CMake / qmake API.
- Add target language in .ts files
- Make file names match the locale (no->nb, jp->ja)
- Using QLocale::uiLanguages() instead of QLocale::system.name()

Change-Id: Ie7d496f38dd13078afab76eca3f7cff13ca27b68
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

25 files changed, 1238 insertions, 0 deletions

diff --git a/examples/linguist/CMakeLists.txt b/examples/linguist/CMakeLists.txt
index 0786d80f2..43098b756 100644
--- a/examples/linguist/CMakeLists.txt
+++ b/examples/linguist/CMakeLists.txt
@@ -3,4 +3,5 @@
 
 qt_internal_add_example(arrowpad)
 qt_internal_add_example(hellotr)
+qt_internal_add_example(i18n)
 qt_internal_add_example(trollprint)
diff --git a/examples/linguist/doc/images/linguist-i18n.png b/examples/linguist/doc/images/linguist-i18n.png
new file mode 100644
index 000000000..20c46c9e6
--- /dev/null
+++ b/examples/linguist/doc/images/linguist-i18n.png
diff --git a/examples/linguist/doc/src/i18n.qdoc b/examples/linguist/doc/src/i18n.qdoc
new file mode 100644
index 000000000..769086461
--- /dev/null
+++ b/examples/linguist/doc/src/i18n.qdoc
@@ -0,0 +1,17 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
+
+/*!
+    \example i18n
+    \title I18N Example
+    \ingroup examples-linguist
+    \brief Demonstrates Qt's support for translated text.
+
+    The Internationalization (I18N) example demonstrates Qt's support for translated
+    text. Developers can write the initial application text in one language, and
+    translations can be provided later without any modifications to the code. It also
+    demonstrates how to detect the system language settings and show the UI in the appropriate
+    languages.
+
+    \image linguist-i18n.png
+*/
diff --git a/examples/linguist/i18n/CMakeLists.txt b/examples/linguist/i18n/CMakeLists.txt
new file mode 100644
index 000000000..2cb380aa2
--- /dev/null
+++ b/examples/linguist/i18n/CMakeLists.txt
@@ -0,0 +1,55 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(i18n LANGUAGES CXX)
+
+set(CMAKE_AUTOMOC ON)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/tools/i18n")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets LinguistTools)
+
+qt_add_executable(i18n
+    languagechooser.cpp languagechooser.h
+    main.cpp
+    mainwindow.cpp mainwindow.h
+)
+
+set_target_properties(i18n PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(i18n PUBLIC
+    Qt::Core
+    Qt::Gui
+    Qt::Widgets
+)
+
+qt_add_translations(i18n TS_FILES
+    translations/i18n_ar.ts
+    translations/i18n_cs.ts
+    translations/i18n_de.ts
+    translations/i18n_el.ts
+    translations/i18n_en.ts
+    translations/i18n_eo.ts
+    translations/i18n_fr.ts
+    translations/i18n_it.ts
+    translations/i18n_ja.ts
+    translations/i18n_ko.ts
+    translations/i18n_nb.ts
+    translations/i18n_ru.ts
+    translations/i18n_sv.ts
+    translations/i18n_zh.ts
+)
+
+install(TARGETS i18n
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)
diff --git a/examples/linguist/i18n/i18n.pro b/examples/linguist/i18n/i18n.pro
new file mode 100644
index 000000000..c15d78007
--- /dev/null
+++ b/examples/linguist/i18n/i18n.pro
@@ -0,0 +1,32 @@
+CONFIG += lrelease embed_translations
+
+QT += widgets
+
+HEADERS = \
+    languagechooser.h \
+    mainwindow.h
+
+SOURCES = \
+    languagechooser.cpp \
+    main.cpp \
+    mainwindow.cpp
+
+TRANSLATIONS += \
+    translations/i18n_ar.ts \
+    translations/i18n_cs.ts \
+    translations/i18n_de.ts \
+    translations/i18n_el.ts \
+    translations/i18n_en.ts \
+    translations/i18n_eo.ts \
+    translations/i18n_fr.ts \
+    translations/i18n_it.ts \
+    translations/i18n_ja.ts \
+    translations/i18n_ko.ts \
+    translations/i18n_nb.ts \
+    translations/i18n_ru.ts \
+    translations/i18n_sv.ts \
+    translations/i18n_zh.ts
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/tools/i18n
+INSTALLS += target
diff --git a/examples/linguist/i18n/languagechooser.cpp b/examples/linguist/i18n/languagechooser.cpp
new file mode 100644
index 000000000..0878c68d7
--- /dev/null
+++ b/examples/linguist/i18n/languagechooser.cpp
@@ -0,0 +1,141 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "languagechooser.h"
+#include "mainwindow.h"
+
+#include <QCoreApplication>
+#include <QCheckBox>
+#include <QDialogButtonBox>
+#include <QDir>
+#include <QGridLayout>
+#include <QGroupBox>
+#include <QPushButton>
+#include <QTranslator>
+
+#include <algorithm>
+
+LanguageChooser::LanguageChooser(QWidget *parent) : QDialog(parent, Qt::WindowStaysOnTopHint)
+{
+    groupBox = new QGroupBox("Languages");
+
+    QGridLayout *groupBoxLayout = new QGridLayout;
+
+    const QStringList qmFiles = findQmFiles();
+    const QStringList uiLanguages = QLocale::system().uiLanguages();
+    for (int i = 0; i < qmFiles.size(); ++i) {
+        const QString &qmlFile = qmFiles.at(i);
+        QCheckBox *checkBox = new QCheckBox(languageName(qmlFile));
+        qmFileForCheckBoxMap.insert(checkBox, qmlFile);
+        connect(checkBox, &QCheckBox::toggled, this, &LanguageChooser::checkBoxToggled);
+        if (std::find_if(
+                    uiLanguages.begin(), uiLanguages.end(),
+                    [qmlFile](const QString &lang) -> bool { return languageMatch(lang, qmlFile); })
+            != uiLanguages.end())
+            checkBox->setCheckState(Qt::Checked);
+        groupBoxLayout->addWidget(checkBox, i / 2, i % 2);
+    }
+    groupBox->setLayout(groupBoxLayout);
+
+    buttonBox = new QDialogButtonBox;
+    showAllButton = buttonBox->addButton("Show All", QDialogButtonBox::ActionRole);
+    hideAllButton = buttonBox->addButton("Hide All", QDialogButtonBox::ActionRole);
+
+    connect(showAllButton, &QAbstractButton::clicked, this, &LanguageChooser::showAll);
+    connect(hideAllButton, &QAbstractButton::clicked, this, &LanguageChooser::hideAll);
+
+    QVBoxLayout *mainLayout = new QVBoxLayout;
+    mainLayout->addWidget(groupBox);
+    mainLayout->addWidget(buttonBox);
+    setLayout(mainLayout);
+
+    setWindowTitle("I18N");
+}
+
+bool LanguageChooser::languageMatch(QStringView lang, QStringView qmFile)
+{
+    // qmFile: i18n_xx.qm
+    const QStringView prefix{ u"i18n_" };
+    const int langTokenLength = 2; /*FIXME: is checking two chars enough?*/
+    return qmFile.mid(qmFile.indexOf(prefix) + prefix.length(), langTokenLength)
+            == lang.left(langTokenLength);
+}
+
+bool LanguageChooser::eventFilter(QObject *object, QEvent *event)
+{
+    if (event->type() == QEvent::Close) {
+        MainWindow *window = qobject_cast<MainWindow *>(object);
+        if (window) {
+            QCheckBox *checkBox = mainWindowForCheckBoxMap.key(window);
+            if (checkBox)
+                checkBox->setChecked(false);
+        }
+    }
+    return QDialog::eventFilter(object, event);
+}
+
+void LanguageChooser::closeEvent(QCloseEvent * /* event */)
+{
+    QCoreApplication::quit();
+}
+
+void LanguageChooser::checkBoxToggled()
+{
+    QCheckBox *checkBox = qobject_cast<QCheckBox *>(sender());
+    MainWindow *window = mainWindowForCheckBoxMap.value(checkBox);
+    if (!window) {
+        QTranslator translator;
+        const QString qmlFile = qmFileForCheckBoxMap.value(checkBox);
+        if (translator.load(qmlFile))
+            QCoreApplication::installTranslator(&translator);
+        else
+            qWarning("Unable to load %s", qPrintable(QDir::toNativeSeparators(qmlFile)));
+
+        window = new MainWindow;
+        window->setPalette(colorForLanguage(checkBox->text()));
+
+        window->installEventFilter(this);
+        mainWindowForCheckBoxMap.insert(checkBox, window);
+    }
+    window->setVisible(checkBox->isChecked());
+}
+
+void LanguageChooser::showAll()
+{
+    for (auto it = qmFileForCheckBoxMap.keyBegin(); it != qmFileForCheckBoxMap.keyEnd(); ++it)
+        (*it)->setChecked(true);
+}
+
+void LanguageChooser::hideAll()
+{
+    for (auto it = qmFileForCheckBoxMap.keyBegin(); it != qmFileForCheckBoxMap.keyEnd(); ++it)
+        (*it)->setChecked(false);
+}
+
+QStringList LanguageChooser::findQmFiles()
+{
+    QDir dir(":/i18n");
+    QStringList fileNames = dir.entryList(QStringList("*.qm"), QDir::Files, QDir::Name);
+    for (QString &fileName : fileNames)
+        fileName = dir.filePath(fileName);
+    return fileNames;
+}
+
+QString LanguageChooser::languageName(const QString &qmFile)
+{
+    QTranslator translator;
+    if (!translator.load(qmFile)) {
+        qWarning("Unable to load %s", qPrintable(QDir::toNativeSeparators(qmFile)));
+        return {};
+    }
+    return translator.translate("MainWindow", "English");
+}
+
+QColor LanguageChooser::colorForLanguage(const QString &language)
+{
+    size_t hashValue = qHash(language);
+    int red = 156 + (hashValue & 0x3F);
+    int green = 156 + ((hashValue >> 6) & 0x3F);
+    int blue = 156 + ((hashValue >> 12) & 0x3F);
+    return QColor(red, green, blue);
+}
diff --git a/examples/linguist/i18n/languagechooser.h b/examples/linguist/i18n/languagechooser.h
new file mode 100644
index 000000000..789f76203
--- /dev/null
+++ b/examples/linguist/i18n/languagechooser.h
@@ -0,0 +1,50 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef LANGUAGECHOOSER_H
+#define LANGUAGECHOOSER_H
+
+#include <QDialog>
+#include <QHash>
+#include <QStringList>
+
+QT_BEGIN_NAMESPACE
+class QAbstractButton;
+class QCheckBox;
+class QDialogButtonBox;
+class QGroupBox;
+QT_END_NAMESPACE
+
+class MainWindow;
+
+class LanguageChooser : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit LanguageChooser(QWidget *parent = nullptr);
+
+protected:
+    bool eventFilter(QObject *object, QEvent *event) override;
+    void closeEvent(QCloseEvent *event) override;
+
+private slots:
+    void checkBoxToggled();
+    void showAll();
+    void hideAll();
+
+private:
+    static QStringList findQmFiles();
+    static QString languageName(const QString &qmFile);
+    static QColor colorForLanguage(const QString &language);
+    static bool languageMatch(QStringView lang, QStringView qmFile);
+
+    QGroupBox *groupBox;
+    QDialogButtonBox *buttonBox;
+    QAbstractButton *showAllButton;
+    QAbstractButton *hideAllButton;
+    QHash<QCheckBox *, QString> qmFileForCheckBoxMap;
+    QHash<QCheckBox *, MainWindow *> mainWindowForCheckBoxMap;
+};
+
+#endif // LANGUAGECHOOSER_H
diff --git a/examples/linguist/i18n/main.cpp b/examples/linguist/i18n/main.cpp
new file mode 100644
index 000000000..f93166102
--- /dev/null
+++ b/examples/linguist/i18n/main.cpp
@@ -0,0 +1,14 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "languagechooser.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    LanguageChooser chooser;
+    chooser.show();
+    return app.exec();
+}
diff --git a/examples/linguist/i18n/mainwindow.cpp b/examples/linguist/i18n/mainwindow.cpp
new file mode 100644
index 000000000..6b8f5b52b
--- /dev/null
+++ b/examples/linguist/i18n/mainwindow.cpp
@@ -0,0 +1,62 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "mainwindow.h"
+
+#include <QAction>
+#include <QCoreApplication>
+#include <QGroupBox>
+#include <QListWidget>
+#include <QMenuBar>
+#include <QRadioButton>
+#include <QStatusBar>
+#include <QVBoxLayout>
+
+static const char *const listEntries[] = { QT_TRANSLATE_NOOP("MainWindow", "First"),
+                                           QT_TRANSLATE_NOOP("MainWindow", "Second"),
+                                           QT_TRANSLATE_NOOP("MainWindow", "Third"), nullptr };
+
+MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
+{
+    centralWidget = new QWidget;
+    setCentralWidget(centralWidget);
+
+    createGroupBox();
+
+    listWidget = new QListWidget;
+    for (const char *entry : listEntries)
+        listWidget->addItem(tr(entry));
+
+    QVBoxLayout *mainLayout = new QVBoxLayout;
+    mainLayout->addWidget(groupBox);
+    mainLayout->addWidget(listWidget);
+    centralWidget->setLayout(mainLayout);
+
+    exitAction = new QAction(tr("E&xit"), this);
+    connect(exitAction, &QAction::triggered, qApp, QCoreApplication::quit);
+
+    fileMenu = menuBar()->addMenu(tr("&File"));
+    fileMenu->setPalette(QPalette(Qt::red));
+    fileMenu->addAction(exitAction);
+
+    setWindowTitle(tr("Language: %1").arg(tr("English")));
+    statusBar()->showMessage(tr("Internationalization Example"));
+
+    if (tr("LTR") == "RTL")
+        setLayoutDirection(Qt::RightToLeft);
+}
+
+void MainWindow::createGroupBox()
+{
+    groupBox = new QGroupBox(tr("View"));
+    perspectiveRadioButton = new QRadioButton(tr("Perspective"));
+    isometricRadioButton = new QRadioButton(tr("Isometric"));
+    obliqueRadioButton = new QRadioButton(tr("Oblique"));
+    perspectiveRadioButton->setChecked(true);
+
+    QVBoxLayout *groupBoxLayout = new QVBoxLayout;
+    groupBoxLayout->addWidget(perspectiveRadioButton);
+    groupBoxLayout->addWidget(isometricRadioButton);
+    groupBoxLayout->addWidget(obliqueRadioButton);
+    groupBox->setLayout(groupBoxLayout);
+}
diff --git a/examples/linguist/i18n/mainwindow.h b/examples/linguist/i18n/mainwindow.h
new file mode 100644
index 000000000..93b75fd27
--- /dev/null
+++ b/examples/linguist/i18n/mainwindow.h
@@ -0,0 +1,39 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+
+QT_BEGIN_NAMESPACE
+class QAction;
+class QGroupBox;
+class QLabel;
+class QListWidget;
+class QMenu;
+class QRadioButton;
+QT_END_NAMESPACE
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow(QWidget *parent = nullptr);
+
+private:
+    void createGroupBox();
+
+    QWidget *centralWidget;
+    QLabel *label;
+    QGroupBox *groupBox;
+    QListWidget *listWidget;
+    QRadioButton *perspectiveRadioButton;
+    QRadioButton *isometricRadioButton;
+    QRadioButton *obliqueRadioButton;
+    QMenu *fileMenu;
+    QAction *exitAction;
+};
+
+#endif // MAINWINDOW_H
diff --git a/examples/linguist/i18n/translations/i18n_ar.ts b/examples/linguist/i18n/translations/i18n_ar.ts
new file mode 100644
index 000000000..f575f2b2a
--- /dev/null
+++ b/examples/linguist/i18n/translations/i18n_ar.ts
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="ar_EG">
+<context>
+    <name>MainWindow</name>
+    <message>
+        <source>First</source>
+        <translation>أول</translation>
+    </message>
+    <message>
+        <source>Internationalization Example</source>
+        <translation>مثال التدويل</translation>
+    </message>
+    <message>
+        <source>Isometric</source>
+        <translation>متماثل</translation>
+    </message>
+    <message>
+        <source>Language: %1</source>
+        <translation>اللغة: %1</translation>
+    </message>
+    <message>
+        <source>English</source>
+        <translation>العربية</translation>
+    </message>
+    <message>
+        <source>Oblique</source>
+        <translation>مصمت</translation>
+    </message>
+    <message>
+        <source>Perspective</source>
+        <translation>منظور</translation>
+    </message>
+    <message>
+        <source>Second</source>
+        <translation>ثانى</translation>
+    </message>
+    <message>
+        <source>Third</source>
+        <translation>ثالث</translation>
+    </message>
+    <message>
+        <source>View</source>
+        <translation>مرئى</translation>
+    </message>
+    <message>
+        <source>E&amp;xit</source>
+        <translation>أخرج</translation>
+    </message>
+    <message>
+        <source>&amp;File</source>
+        <translation>الملف</translation>
+    </message>
+    <message>
+        <source>LTR</source>
+        <translation>RTL</translation>
+    </message>
+</context>
+</TS>
diff --git a/examples/linguist/i18n/translations/i18n_cs.ts b/examples/linguist/i18n/translations/i18n_cs.ts
new file mode 100644
index 000000000..d05d5c875
--- /dev/null
+++ b/examples/linguist/i18n/translations/i18n_cs.ts
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="cs_CZ">
+<context>
+    <name>MainWindow</name>
+    <message>
+        <source>View</source>
+        <translation>Pohled</translation>
+    </message>
+    <message>
+        <source>&amp;File</source>
+        <translation>&amp;Soubor</translation>
+    </message>
+    <message>
+        <source>E&amp;xit</source>
+        <translation>&amp;Konec</translation>
+    </message>
+    <message>
+        <source>First</source>
+        <translation>První</translation>
+    </message>
+    <message>
+        <source>Third</source>
+        <translation>Třetí</translation>
+    </message>
+    <message>
+        <source>Language: %1</source>
+        <translation>Jayzk: %1</translation>
+    </message>
+    <message>
+        <source>English</source>
+        <translation>Český</translation>
+    </message>
+    <message>
+        <source>Oblique</source>
+        <translation>Nakloněný</translation>
+    </message>
+    <message>
+        <source>Second</source>
+        <translation>Druhý</translation>
+    </message>
+    <message>
+        <source>Isometric</source>
+        <translation>Isometrický</translation>
+    </message>
+    <message>
+        <source>Perspective</source>
+        <translation>Perspektivní</translation>
+    </message>
+    <message>
+        <source>Internationalization Example</source>
+        <translation>Ukázka lokalizace</translation>
+    </message>
+    <message>
+        <source>LTR</source>
+        <translation>LTR</translation>
+    </message>
+</context>
+</TS>
diff --git a/examples/linguist/i18n/translations/i18n_de.ts b/examples/linguist/i18n/translations/i18n_de.ts
new file mode 100644
index 000000000..155b6b54d
--- /dev/null
+++ b/examples/linguist/i18n/translations/i18n_de.ts
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="de_DE">
+<context>
+    <name>MainWindow</name>
+    <message>
+        <source>View</source>
+        <translation>Ansicht</translation>
+    </message>
+    <message>
+        <source>&amp;File</source>
+        <translation>&amp;Datei</translation>
+    </message>
+    <message>
+        <source>E&amp;xit</source>
+        <translation>Be&amp;enden</translation>
+    </message>
+    <message>
+        <source>First</source>
+        <translation>Erstens</translation>
+    </message>
+    <message>
+        <source>Third</source>
+        <translation>Drittens</translation>
+    </message>
+    <message>
+        <source>English</source>
+        <translation>Deutsch</translation>
+    </message>
+    <message>
+        <source>Language: %1</source>
+        <translation>Sprache: %1</translation>
+    </message>
+    <message>
+        <source>Oblique</source>
+        <translation>Schief</translation>
+    </message>
+    <message>
+        <source>Second</source>
+        <translation>Zweitens</translation>
+    </message>
+    <message>
+        <source>Isometric</source>
+        <translation>Isometrisch</translation>
+    </message>
+    <message>
+        <source>Perspective</source>
+        <translation>Perspektivisch</translation>
+    </message>
+    <message>
+        <source>Internationalization Example</source>
+        <translation>Internationalisierungsbeispiel</translation>
+    </message>
+    <message>
+        <source>LTR</source>
+        <translation>LTR</translation>
+    </message>
+</context>
+</TS>
diff --git a/examples/linguist/i18n/translations/i18n_el.ts b/examples/linguist/i18n/translations/i18n_el.ts
new file mode 100644
index 000000000..e87ef2431
--- /dev/null
+++ b/examples/linguist/i18n/translations/i18n_el.ts
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="el_GR">
+<context>
+    <name>MainWindow</name>
+    <message>
+        <source>&amp;File</source>
+        <translation>&amp;Αρχείο</translation>
+    </message>
+    <message>
+        <source>E&amp;xit</source>
+        <translation>Έ&amp;ξοδος</translation>
+    </message>
+    <message>
+        <source>First</source>
+        <translation>Πρώτο</translation>
+    </message>
+    <message>
+        <source>Internationalization Example</source>
+        <translation>Παράδειγμα διεθνοποίησης</translation>
+    </message>
+    <message>
+        <source>Isometric</source>
+        <translation>Ισομετρική</translation>
+    </message>
+    <message>
+        <source>Language: %1</source>
+        <translation>Γλώσσα: %1</translation>
+    </message>
+    <message>
+        <source>English</source>
+        <translation>Ελληνικά</translation>
+    </message>
+    <message>
+        <source>Oblique</source>
+        <translation>Πλάγια</translation>
+    </message>
+    <message>
+        <source>Perspective</source>
+        <translation>Προοπτική</translation>
+    </message>
+    <message>
+        <source>Second</source>
+        <translation>Δεύτερο</translation>
+    </message>
+    <message>
+        <source>Third</source>
+        <translation>Τρίτο</translation>
+    </message>
+    <message>
+        <source>View</source>
+        <translation>Όψη</translation>
+    </message>
+    <message>
+        <source>LTR</source>
+        <translation>LTR</translation>
+    </message>
+</context>
+</TS>
diff --git a/examples/linguist/i18n/translations/i18n_en.ts b/examples/linguist/i18n/translations/i18n_en.ts
new file mode 100644
index 000000000..9c6c0bf9b
--- /dev/null
+++ b/examples/linguist/i18n/translations/i18n_en.ts
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="en_US">
+<context>
+    <name>MainWindow</name>
+    <message>
+        <source>E&amp;xit</source>
+        <translation>E&amp;xit</translation>
+    </message>
+    <message>
+        <source>&amp;File</source>
+        <translation>&amp;File</translation>
+    </message>
+    <message>
+        <source>Internationalization Example</source>
+        <translation>Internationalization Example</translation>
+    </message>
+    <message>
+        <source>Language: %1</source>
+        <translation>Language: %1</translation>
+    </message>
+    <message>
+        <source>English</source>
+        <translation>English</translation>
+    </message>
+    <message>
+        <source>View</source>
+        <translation>View</translation>
+    </message>
+    <message>
+        <source>Perspective</source>
+        <translation>Perspective</translation>
+    </message>
+    <message>
+        <source>Isometric</source>
+        <translation>Isometric</translation>
+    </message>
+    <message>
+        <source>Oblique</source>
+        <translation>Oblique</translation>
+    </message>
+    <message>
+        <source>First</source>
+        <translation>First</translation>
+    </message>
+    <message>
+        <source>Second</source>
+        <translation>Second</translation>
+    </message>
+    <message>
+        <source>Third</source>
+        <translation>Third</translation>
+    </message>
+    <message>
+        <source>LTR</source>
+        <translation>LTR</translation>
+    </message>
+</context>
+</TS>
diff --git a/examples/linguist/i18n/translations/i18n_eo.ts b/examples/linguist/i18n/translations/i18n_eo.ts
new file mode 100644
index 000000000..0e95f9df3
--- /dev/null
+++ b/examples/linguist/i18n/translations/i18n_eo.ts
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="eo_001">
+<context>
+    <name>MainWindow</name>
+    <message>
+        <source>&amp;File</source>
+        <translation>&amp;Dosiero</translation>
+    </message>
+    <message>
+        <source>First</source>
+        <translation>Unue</translation>
+    </message>
+    <message>
+        <source>Internationalization Example</source>
+        <translation>Ekzemplo pri internaciigo</translation>
+    </message>
+    <message>
+        <source>Isometric</source>
+        <translation>Isometria</translation>
+    </message>
+    <message>
+        <source>Language: %1</source>
+        <translation>Lingvo: %1</translation>
+    </message>
+    <message>
+        <source>English</source>
+        <translation>Esperanto</translation>
+    </message>
+    <message>
+        <source>Oblique</source>
+        <translation>Oblikva</translation>
+    </message>
+    <message>
+        <source>Perspective</source>
+        <translation>Perspektiva</translation>
+    </message>
+    <message>
+        <source>Second</source>
+        <translation>Due</translation>
+    </message>
+    <message>
+        <source>Third</source>
+        <translation>Trie</translation>
+    </message>
+    <message>
+        <source>View</source>
+        <translation>Aspekto</translation>
+    </message>
+    <message>
+        <source>E&amp;xit</source>
+        <translation>&amp;Fini</translation>
+    </message>
+    <message>
+        <source>LTR</source>
+        <translation>LTR</translation>
+    </message>
+</context>
+</TS>
diff --git a/examples/linguist/i18n/translations/i18n_fr.ts b/examples/linguist/i18n/translations/i18n_fr.ts
new file mode 100644
index 000000000..58cdd7a58
--- /dev/null
+++ b/examples/linguist/i18n/translations/i18n_fr.ts
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="fr_FR">
+<context>
+    <name>MainWindow</name>
+    <message>
+        <source>View</source>
+        <translation>Vue</translation>
+    </message>
+    <message>
+        <source>&amp;File</source>
+        <translation>&amp;Fichier</translation>
+    </message>
+    <message>
+        <source>E&amp;xit</source>
+        <translation>&amp;Quitter</translation>
+    </message>
+    <message>
+        <source>First</source>
+        <translation>Premier</translation>
+    </message>
+    <message>
+        <source>Third</source>
+        <translation>Troisième</translation>
+    </message>
+    <message>
+        <source>Language: %1</source>
+        <translation>Langue : %1</translation>
+    </message>
+    <message>
+        <source>English</source>
+        <translation>Français</translation>
+    </message>
+    <message>
+        <source>Oblique</source>
+        <translation>Oblique</translation>
+    </message>
+    <message>
+        <source>Second</source>
+        <translation>Deuxième</translation>
+    </message>
+    <message>
+        <source>Isometric</source>
+        <translation>Isométrique</translation>
+    </message>
+    <message>
+        <source>Perspective</source>
+        <translation>Perspective</translation>
+    </message>
+    <message>
+        <source>Internationalization Example</source>
+        <translation>Exemple d&apos;internationalisation</translation>
+    </message>
+    <message>
+        <source>LTR</source>
+        <translation>LTR</translation>
+    </message>
+</context>
+</TS>
diff --git a/examples/linguist/i18n/translations/i18n_it.ts b/examples/linguist/i18n/translations/i18n_it.ts
new file mode 100644
index 000000000..62facf0dc
--- /dev/null
+++ b/examples/linguist/i18n/translations/i18n_it.ts
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="it_IT">
+<context>
+    <name>MainWindow</name>
+    <message>
+        <source>First</source>
+        <translation>Primo</translation>
+    </message>
+    <message>
+        <source>Internationalization Example</source>
+        <translation>Esempio di localizzazione</translation>
+    </message>
+    <message>
+        <source>Isometric</source>
+        <translation>Isometrica</translation>
+    </message>
+    <message>
+        <source>Language: %1</source>
+        <translation>Lingua: %1</translation>
+    </message>
+    <message>
+        <source>English</source>
+        <translation>Italiano</translation>
+    </message>
+    <message>
+        <source>Oblique</source>
+        <translation>Obliqua</translation>
+    </message>
+    <message>
+        <source>Perspective</source>
+        <translation>Prospettica</translation>
+    </message>
+    <message>
+        <source>Second</source>
+        <translation>Secondo</translation>
+    </message>
+    <message>
+        <source>Third</source>
+        <translation>Terzo</translation>
+    </message>
+    <message>
+        <source>View</source>
+        <translation>Vista</translation>
+    </message>
+    <message>
+        <source>E&amp;xit</source>
+        <translation>&amp;Esci</translation>
+    </message>
+    <message>
+        <source>&amp;File</source>
+        <translation>&amp;File</translation>
+    </message>
+    <message>
+        <source>LTR</source>
+        <translation>LTR</translation>
+    </message>
+</context>
+</TS>
diff --git a/examples/linguist/i18n/translations/i18n_ja.ts b/examples/linguist/i18n/translations/i18n_ja.ts
new file mode 100644
index 000000000..e7fe10a38
--- /dev/null
+++ b/examples/linguist/i18n/translations/i18n_ja.ts
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="ja_JP">
+<context>
+    <name>MainWindow</name>
+    <message>
+        <source>&amp;File</source>
+        <translation>ファイル(&amp;F)</translation>
+    </message>
+    <message>
+        <source>E&amp;xit</source>
+        <translation>終了(&amp;X)</translation>
+    </message>
+    <message>
+        <source>First</source>
+        <translation>第一行</translation>
+    </message>
+    <message>
+        <source>Internationalization Example</source>
+        <translation>国際化(i18n)の例</translation>
+    </message>
+    <message>
+        <source>Isometric</source>
+        <translation>等角投影法</translation>
+    </message>
+    <message>
+        <source>Language: %1</source>
+        <translation>言語: %1</translation>
+    </message>
+    <message>
+        <source>English</source>
+        <translation>日本語</translation>
+    </message>
+    <message>
+        <source>Oblique</source>
+        <translation>斜め投影法</translation>
+    </message>
+    <message>
+        <source>Perspective</source>
+        <translation>遠近法</translation>
+    </message>
+    <message>
+        <source>Second</source>
+        <translation>第二行</translation>
+    </message>
+    <message>
+        <source>Third</source>
+        <translation>第三行</translation>
+    </message>
+    <message>
+        <source>View</source>
+        <translation>表示方式</translation>
+    </message>
+    <message>
+        <source>LTR</source>
+        <translation>LTR</translation>
+    </message>
+</context>
+</TS>
diff --git a/examples/linguist/i18n/translations/i18n_ko.ts b/examples/linguist/i18n/translations/i18n_ko.ts
new file mode 100644
index 000000000..ab921c8df
--- /dev/null
+++ b/examples/linguist/i18n/translations/i18n_ko.ts
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="ko_KR">
+<context>
+    <name>MainWindow</name>
+    <message>
+        <source>&amp;File</source>
+        <translation>파일&amp;F</translation>
+    </message>
+    <message>
+        <source>E&amp;xit</source>
+        <translation>종료&amp;X</translation>
+    </message>
+    <message>
+        <source>First</source>
+        <translation>첫번째</translation>
+    </message>
+    <message>
+        <source>Internationalization Example</source>
+        <translation>국제화 예제</translation>
+    </message>
+    <message>
+        <source>Isometric</source>
+        <translation>등측도</translation>
+    </message>
+    <message>
+        <source>Language: %1</source>
+        <translation>언어 : %1</translation>
+    </message>
+    <message>
+        <source>English</source>
+        <translation>한국어</translation>
+    </message>
+    <message>
+        <source>Oblique</source>
+        <translation>빗각</translation>
+    </message>
+    <message>
+        <source>Perspective</source>
+        <translation>원근화법</translation>
+    </message>
+    <message>
+        <source>Second</source>
+        <translation>두번째</translation>
+    </message>
+    <message>
+        <source>Third</source>
+        <translation>세번째</translation>
+    </message>
+    <message>
+        <source>View</source>
+        <translation>보기</translation>
+    </message>
+    <message>
+        <source>LTR</source>
+        <translation>LTR</translation>
+    </message>
+</context>
+</TS>
diff --git a/examples/linguist/i18n/translations/i18n_nb.ts b/examples/linguist/i18n/translations/i18n_nb.ts
new file mode 100644
index 000000000..076ed3a05
--- /dev/null
+++ b/examples/linguist/i18n/translations/i18n_nb.ts
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="nb_NO">
+<context>
+    <name>MainWindow</name>
+    <message>
+        <source>View</source>
+        <translation>Vis</translation>
+    </message>
+    <message>
+        <source>&amp;File</source>
+        <translation>&amp;Fil</translation>
+    </message>
+    <message>
+        <source>E&amp;xit</source>
+        <translation>&amp;Avslutt</translation>
+    </message>
+    <message>
+        <source>First</source>
+        <translation>Første</translation>
+    </message>
+    <message>
+        <source>Third</source>
+        <translation>Tredje</translation>
+    </message>
+    <message>
+        <source>Language: %1</source>
+        <translation>Språk: %1</translation>
+    </message>
+    <message>
+        <source>English</source>
+        <translation>Norsk</translation>
+    </message>
+    <message>
+        <source>Oblique</source>
+        <translation>Skjevt</translation>
+    </message>
+    <message>
+        <source>Second</source>
+        <translation>Andre</translation>
+    </message>
+    <message>
+        <source>Isometric</source>
+        <translation>Isometrisk</translation>
+    </message>
+    <message>
+        <source>Perspective</source>
+        <translation>Perspektiv</translation>
+    </message>
+    <message>
+        <source>Internationalization Example</source>
+        <translation>Internasjonaliseringseksempel</translation>
+    </message>
+    <message>
+        <source>LTR</source>
+        <translation>LTR</translation>
+    </message>
+</context>
+</TS>
diff --git a/examples/linguist/i18n/translations/i18n_ru.ts b/examples/linguist/i18n/translations/i18n_ru.ts
new file mode 100644
index 000000000..7c7645d44
--- /dev/null
+++ b/examples/linguist/i18n/translations/i18n_ru.ts
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="ru_RU">
+<context>
+    <name>MainWindow</name>
+    <message>
+        <source>View</source>
+        <translation>Вид</translation>
+    </message>
+    <message>
+        <source>&amp;File</source>
+        <translation>Файл</translation>
+    </message>
+    <message>
+        <source>E&amp;xit</source>
+        <translation>Выход</translation>
+    </message>
+    <message>
+        <source>First</source>
+        <translation>Первый</translation>
+    </message>
+    <message>
+        <source>Third</source>
+        <translation>Третий</translation>
+    </message>
+    <message>
+        <source>Language: %1</source>
+        <translation>Язык: %1</translation>
+    </message>
+    <message>
+        <source>English</source>
+        <translation>Русский</translation>
+    </message>
+    <message>
+        <source>Oblique</source>
+        <translation>Курсив</translation>
+    </message>
+    <message>
+        <source>Second</source>
+        <translation>Второй</translation>
+    </message>
+    <message>
+        <source>Isometric</source>
+        <translation>Изометрический</translation>
+    </message>
+    <message>
+        <source>Perspective</source>
+        <translation>Перспектива</translation>
+    </message>
+    <message>
+        <source>Internationalization Example</source>
+        <translation>Пример интернационализации</translation>
+    </message>
+    <message>
+        <source>LTR</source>
+        <translation>LTR</translation>
+    </message>
+</context>
+</TS>
diff --git a/examples/linguist/i18n/translations/i18n_sv.ts b/examples/linguist/i18n/translations/i18n_sv.ts
new file mode 100644
index 000000000..b7b3a45fa
--- /dev/null
+++ b/examples/linguist/i18n/translations/i18n_sv.ts
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="sv_SE">
+<context>
+    <name>MainWindow</name>
+    <message>
+        <source>View</source>
+        <translation>Visa</translation>
+    </message>
+    <message>
+        <source>&amp;File</source>
+        <translation>&amp;Arkiv</translation>
+    </message>
+    <message>
+        <source>E&amp;xit</source>
+        <translation>&amp;Avsluta</translation>
+    </message>
+    <message>
+        <source>First</source>
+        <translation>Första</translation>
+    </message>
+    <message>
+        <source>Third</source>
+        <translation>Tredje</translation>
+    </message>
+    <message>
+        <source>Language: %1</source>
+        <translation>Språk: %1</translation>
+    </message>
+    <message>
+        <source>English</source>
+        <translation>Svenska</translation>
+    </message>
+    <message>
+        <source>Oblique</source>
+        <translation>Skevt</translation>
+    </message>
+    <message>
+        <source>Second</source>
+        <translation>Andra</translation>
+    </message>
+    <message>
+        <source>Isometric</source>
+        <translation>Isometriskt</translation>
+    </message>
+    <message>
+        <source>Perspective</source>
+        <translation>Perspektivt</translation>
+    </message>
+    <message>
+        <source>Internationalization Example</source>
+        <translation>Internationaliseringsexempel</translation>
+    </message>
+    <message>
+        <source>LTR</source>
+        <translation>LTR</translation>
+    </message>
+</context>
+</TS>
diff --git a/examples/linguist/i18n/translations/i18n_zh.ts b/examples/linguist/i18n/translations/i18n_zh.ts
new file mode 100644
index 000000000..8701d76af
--- /dev/null
+++ b/examples/linguist/i18n/translations/i18n_zh.ts
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="zh_CN">
+<context>
+    <name>MainWindow</name>
+    <message>
+        <source>View</source>
+        <translation>视图</translation>
+    </message>
+    <message>
+        <source>&amp;File</source>
+        <translation>文件[&amp;F]</translation>
+    </message>
+    <message>
+        <source>E&amp;xit</source>
+        <translation>退出[&amp;x]</translation>
+    </message>
+    <message>
+        <source>First</source>
+        <translation>第一个</translation>
+    </message>
+    <message>
+        <source>Third</source>
+        <translation>第三个</translation>
+    </message>
+    <message>
+        <source>Language: %1</source>
+        <translation>语言: %1</translation>
+    </message>
+    <message>
+        <source>English</source>
+        <translation>简体中文</translation>
+    </message>
+    <message>
+        <source>Oblique</source>
+        <translation>斜投影</translation>
+    </message>
+    <message>
+        <source>Second</source>
+        <translation>第二个</translation>
+    </message>
+    <message>
+        <source>Isometric</source>
+        <translation>等角投影</translation>
+    </message>
+    <message>
+        <source>Perspective</source>
+        <translation>透视投影</translation>
+    </message>
+    <message>
+        <source>Internationalization Example</source>
+        <translation>国际化范例</translation>
+    </message>
+    <message>
+        <source>LTR</source>
+        <translation>LTR</translation>
+    </message>
+</context>
+</TS>
diff --git a/examples/linguist/linguist.pro b/examples/linguist/linguist.pro
index 79e96820c..2d30450de 100644
--- a/examples/linguist/linguist.pro
+++ b/examples/linguist/linguist.pro
@@ -1,4 +1,5 @@
 TEMPLATE      = subdirs
 SUBDIRS       = arrowpad \
                 hellotr \
+                i18n \
                 trollprint