diff -r 593a658cba8e -r 73e448b2943d src/mainwindow.cpp
--- a/src/mainwindow.cpp	Thu Oct 03 11:45:44 2019 +0300
+++ b/src/mainwindow.cpp	Thu Oct 03 23:44:28 2019 +0300
@@ -9,10 +9,13 @@
 	ui{std::make_unique<Ui_MainWindow>()},
 	documents{this}
 {
-	ui->setupUi(this);
+	this->ui->setupUi(this);
 	connect(ui->actionNew, &QAction::triggered, this, &MainWindow::newModel);
+	connect(ui->actionOpen, &QAction::triggered, this, &MainWindow::openModel);
 	connect(ui->actionQuit, &QAction::triggered, this, &QMainWindow::close);
-	updateTitle();
+	this->updateTitle();
+	this->loadLocales();
+	changeLanguage(QLocale::system().name());
 }
 
 MainWindow::~MainWindow()
@@ -30,7 +33,7 @@
 void MainWindow::openModel()
 {
 	const QString path = QFileDialog::getOpenFileName(
-		this, "Open model", "", "LDraw models (*.ldr *.dat)");
+		this, tr("Open model"), "", tr("LDraw models (*.ldr *.dat)"));
 	if (not path.isEmpty())
 	{
 		QFile file{path};
@@ -41,8 +44,8 @@
 		}
 		else
 		{
-			QMessageBox::critical(this, "Problem opening file",
-				QString{"Could not open %1: %2"}
+			QMessageBox::critical(this, tr("Problem opening file"),
+				tr("Could not open %1: %2")
 					.arg(path)
 					.arg(file.errorString()));
 		}
@@ -50,6 +53,51 @@
 }
 
 /**
+ * @brief Changes the application language to the specified language
+ * @param localeCode Code of the locale to translate to
+ */
+void MainWindow::changeLanguage(const QString& localeCode)
+{
+	if (not localeCode.isEmpty() and localeCode != this->currentLanguage)
+	{
+		this->currentLanguage = localeCode;
+		QLocale::setDefault({localeCode});
+		qApp->removeTranslator(&this->translator);
+		const bool loadSuccessful = this->translator.load(pathToTranslation(localeCode));
+		if (loadSuccessful)
+		{
+			qApp->installTranslator(&this->translator);
+		}
+	}
+}
+
+void MainWindow::languageChangeRequested()
+{
+	QAction* const senderAction = qobject_cast<QAction*>(sender());
+	if (senderAction != nullptr)
+	{
+		const QString localeCode = senderAction->data().toString();
+		this->changeLanguage(localeCode);
+	}
+}
+
+void MainWindow::changeEvent(QEvent* event)
+{
+	if (event != nullptr)
+	{
+		switch (event->type())
+		{
+		case QEvent::LanguageChange:
+			this->ui->retranslateUi(this);
+			break;
+		default:
+			break;
+		}
+	}
+	QMainWindow::changeEvent(event);
+}
+
+/**
  * @brief Creates a new tab widget for the specified model.
  * @param model Model to get a new tab widget for
  * @return widget
@@ -105,3 +153,31 @@
 	title += fullVersionString();
 	setWindowTitle(title);
 }
+
+QString MainWindow::pathToTranslation(const QString& localeCode)
+{
+	QDir dir {":/locale"};
+	return dir.filePath(localeCode + ".qm");
+}
+
+void MainWindow::loadLocales()
+{
+	QDir dir {":/locale"};
+	this->ui->menuLanguage->clear();
+	QVector<QString> localeCodes = {"en"};
+	for (const QFileInfo& file : dir.entryInfoList(QDir::Files))
+	{
+		localeCodes.append(file.baseName());
+	}
+	for (const QString& localeCode : localeCodes)
+	{
+		const QLocale locale{localeCode};
+		const QString languageName = QLocale::languageToString(locale.language());
+		const QIcon flag{":/flags/" + localeCode + ".png"};
+		QAction* action = new QAction{languageName, this};
+		action->setData(localeCode);
+		action->setIcon(flag);
+		this->ui->menuLanguage->addAction(action);
+		connect(action, &QAction::triggered, this, &MainWindow::languageChangeRequested);
+	}
+}