diff --git a/src/plugins/autotest/testresultmodel.cpp b/src/plugins/autotest/testresultmodel.cpp
index 386c22c73c3..f91ad9e097b 100644
--- a/src/plugins/autotest/testresultmodel.cpp
+++ b/src/plugins/autotest/testresultmodel.cpp
@@ -395,7 +395,7 @@ int TestResultModel::resultTypeCount(ResultType type) const
 {
     int result = 0;
 
-    for (const auto &id : m_reportedSummary.keys()) {
+    for (const auto &id : m_testResultCount.keys()) {
         // if we got a result count from the framework prefer that over our counted results
         int reported = m_reportedSummary[id].value(type);
         result += reported != 0 ? reported : m_testResultCount.value(id).value(type);
diff --git a/src/plugins/qmldesigner/qmlpreviewplugin/qmlpreviewactions.cpp b/src/plugins/qmldesigner/qmlpreviewplugin/qmlpreviewactions.cpp
index 616678d8557..75d26a02155 100644
--- a/src/plugins/qmldesigner/qmlpreviewplugin/qmlpreviewactions.cpp
+++ b/src/plugins/qmldesigner/qmlpreviewplugin/qmlpreviewactions.cpp
@@ -217,6 +217,8 @@ SwitchLanguageComboboxAction::SwitchLanguageComboboxAction(QObject *parent)
 QWidget *SwitchLanguageComboboxAction::createWidget(QWidget *parent)
 {
     QPointer<QComboBox> comboBox = new QComboBox(parent);
+    // FIXME: this combobox does not work at the moment
+    comboBox->setDisabled(true);
     const QString toolTip(tr("Switch the language used by preview."));
     comboBox->setToolTip(toolTip);
     comboBox->addItem(tr("Default"));
diff --git a/src/plugins/qmlpreview/qmldebugtranslationclient.cpp b/src/plugins/qmlpreview/qmldebugtranslationclient.cpp
index d62d3d0d204..6ebc13d8f8a 100644
--- a/src/plugins/qmlpreview/qmldebugtranslationclient.cpp
+++ b/src/plugins/qmlpreview/qmldebugtranslationclient.cpp
@@ -36,24 +36,24 @@ QmlDebugTranslationClient::QmlDebugTranslationClient(QmlDebug::QmlDebugConnectio
 {
 }
 
-void QmlDebugTranslationClient::changeLanguage(const QUrl &url, const QString &locale)
+void QmlDebugTranslationClient::changeLanguage(const QUrl &url, const QString &localeIsoCode)
 {
     QmlDebug::QPacket packet(dataStreamVersion());
-    packet << static_cast<qint8>(ChangeLanguage) << url << locale;
+    packet << static_cast<qint8>(Command::ChangeLanguage) << url << localeIsoCode;
     sendMessage(packet.data());
 }
 
 void QmlDebugTranslationClient::changeWarningColor(const QColor &warningColor)
 {
     QmlDebug::QPacket packet(dataStreamVersion());
-    packet << static_cast<qint8>(ChangeWarningColor) << warningColor;
+    packet << static_cast<qint8>(Command::ChangeWarningColor) << warningColor;
     sendMessage(packet.data());
 }
 
 void QmlDebugTranslationClient::changeElidedTextWarningString(const QString &warningString)
 {
     QmlDebug::QPacket packet(dataStreamVersion());
-    packet << static_cast<qint8>(ChangeElidedTextWarningString) << warningString;
+    packet << static_cast<qint8>(Command::ChangeElidedTextWarningString) << warningString;
     sendMessage(packet.data());
 }
 
@@ -68,21 +68,21 @@ void QmlDebugTranslationClient::changeElideWarning(bool elideWarning)
 void QmlDebugTranslationClient::setDebugTranslationServiceLogFile(const QString &logFilePath)
 {
     QmlDebug::QPacket packet(dataStreamVersion());
-    packet << static_cast<qint8>(SetDebugTranslationServiceLogFile) << logFilePath;
+    packet << static_cast<qint8>(Command::SetDebugTranslationServiceLogFile) << logFilePath;
     sendMessage(packet.data());
 }
 
 void QmlDebugTranslationClient::enableElidedTextWarning()
 {
     QmlDebug::QPacket packet(dataStreamVersion());
-    packet << static_cast<qint8>(EnableElidedTextWarning);
+    packet << static_cast<qint8>(Command::EnableElidedTextWarning);
     sendMessage(packet.data());
 }
 
 void QmlDebugTranslationClient::disableElidedTextWarning()
 {
     QmlDebug::QPacket packet(dataStreamVersion());
-    packet << static_cast<qint8>(DisableElidedTextWarning);
+    packet << static_cast<qint8>(Command::DisableElidedTextWarning);
     sendMessage(packet.data());
 }
 
@@ -91,7 +91,7 @@ void QmlDebugTranslationClient::messageReceived(const QByteArray &data)
     QmlDebug::QPacket packet(dataStreamVersion(), data);
     qint8 command;
     packet >> command;
-    qDebug() << "invalid command" << command;
+    qDebug() << Q_FUNC_INFO << "invalid command" << command;
 }
 
 void QmlDebugTranslationClient::stateChanged(QmlDebug::QmlDebugClient::State state)
diff --git a/src/plugins/qmlpreview/qmldebugtranslationclient.h b/src/plugins/qmlpreview/qmldebugtranslationclient.h
index 2b69e99b0a6..db00b6f0056 100644
--- a/src/plugins/qmlpreview/qmldebugtranslationclient.h
+++ b/src/plugins/qmlpreview/qmldebugtranslationclient.h
@@ -35,19 +35,20 @@ class QMLPREVIEW_EXPORT QmlDebugTranslationClient : public QmlDebug::QmlDebugCli
     Q_OBJECT
 public:
     //needs to be in sync with QQmlDebugTranslationClient in qtdeclarative/src/plugins/qmltooling/qmldbg_preview/qqmldebugtranslationservice.h
-    enum Command {
+    enum class Command {
         ChangeLanguage,
+        MissingTranslationsChecked,
+        EnableElidedTextWarning,
+        DisableElidedTextWarning,
         ChangeWarningColor,
         ChangeElidedTextWarningString,
         SetDebugTranslationServiceLogFile,
-        EnableElidedTextWarning,
-        DisableElidedTextWarning,
         TestAllLanguages
     };
 
     explicit QmlDebugTranslationClient(QmlDebug::QmlDebugConnection *connection);
 
-    void changeLanguage(const QUrl &url, const QString &locale);
+    void changeLanguage(const QUrl &url, const QString &localeIsoCode);
     void changeWarningColor(const QColor &warningColor);
     void changeElidedTextWarningString(const QString &warningString); //is QByteArray better here?
     void changeElideWarning(bool elideWarning);
diff --git a/src/plugins/qmlpreview/qmldebugtranslationwidget.cpp b/src/plugins/qmlpreview/qmldebugtranslationwidget.cpp
index b9d289a0106..d1c7c9f2891 100644
--- a/src/plugins/qmlpreview/qmldebugtranslationwidget.cpp
+++ b/src/plugins/qmlpreview/qmldebugtranslationwidget.cpp
@@ -91,8 +91,9 @@ QObject *getPreviewPlugin()
 
 namespace QmlPreview {
 
-QmlDebugTranslationWidget::QmlDebugTranslationWidget(QWidget *parent)
+QmlDebugTranslationWidget::QmlDebugTranslationWidget(QWidget *parent, TestLanguageGetter languagesGetterMethod)
     : QWidget(parent)
+    , m_testLanguagesGetter(languagesGetterMethod)
 {
     auto mainLayout = new QVBoxLayout(this);
 
@@ -124,6 +125,7 @@ QmlDebugTranslationWidget::QmlDebugTranslationWidget(QWidget *parent)
     layout()->addWidget(elideWarningCheckBox);
     connect(elideWarningCheckBox, &QCheckBox::stateChanged, [this] (int state) {
         m_elideWarning = (state == Qt::Checked);
+
     });
 
     auto controlLayout = new QHBoxLayout;
@@ -232,6 +234,7 @@ void QmlDebugTranslationWidget::updateStartupProjectTranslations()
 
 void QmlDebugTranslationWidget::updateCurrentTranslations(ProjectExplorer::Project *project)
 {
+    m_testLanguages.clear();
     for (int i = m_selectLanguageLayout->count()-1; i >= 0; --i) {
         auto layoutItem = m_selectLanguageLayout->takeAt(i);
         delete layoutItem->widget();
@@ -244,28 +247,23 @@ void QmlDebugTranslationWidget::updateCurrentTranslations(ProjectExplorer::Proje
         connect(multiLanguageAspect, &QmlProjectManager::QmlMultiLanguageAspect::changed,
                 this, &QmlDebugTranslationWidget::updateStartupProjectTranslations,
                 Qt::UniqueConnection);
+        auto languageLabel = new QLabel();
+        languageLabel->setText(tr("Select which language should be tested:"));
+        m_selectLanguageLayout->addWidget(languageLabel);
         if (multiLanguageAspect->value()) {
-            m_selectLanguageLayout->addWidget(new QLabel(
-                tr("Current language is \'<b>%1</b>\' can be changed in the 'Translation' tab.")
-                    .arg(multiLanguageAspect->currentLocale())));
-            m_testLanguages.clear();
-            m_testLanguages.append(multiLanguageAspect->currentLocale());
-        } else {
-            m_selectLanguageLayout->addWidget(new QLabel(tr("Select which language should be tested:")));
-            QString errorMessage;
-            for (auto language : project->availableQmlPreviewTranslations(&errorMessage)) {
-                auto languageCheckBox = new QCheckBox(language);
-                m_selectLanguageLayout->addWidget(languageCheckBox);
-                connect(languageCheckBox, &QCheckBox::stateChanged, [this, language] (int state) {
-                    if (state == Qt::Checked)
-                        m_testLanguages.append(language);
-                    else
-                        m_testLanguages.removeAll(language);
+            addLanguageCheckBoxes({multiLanguageAspect->currentLocale()});
+            if (m_testLanguagesGetter) {
+                auto addTestLanguages = new QPushButton(tr("Add Test Languages"));
+                m_selectLanguageLayout->addWidget(addTestLanguages);
+                connect(addTestLanguages, &QPushButton::clicked, [this]() {
+                    addLanguageCheckBoxes(m_testLanguagesGetter());
                 });
-                languageCheckBox->setChecked(true);
             }
-            m_selectLanguageLayout->addItem(new QSpacerItem(20, 20, QSizePolicy::Expanding, QSizePolicy::Minimum));
+        } else {
+            QString errorMessage;
+            addLanguageCheckBoxes(project->availableQmlPreviewTranslations(&errorMessage));
         }
+        m_selectLanguageLayout->addItem(new QSpacerItem(20, 20, QSizePolicy::Expanding, QSizePolicy::Minimum));
     }
 }
 
@@ -298,14 +296,16 @@ void QmlDebugTranslationWidget::runTest()
         int timerCounter = 1;
         const auto testLanguageList = m_testLanguages;
 
+        if (m_elideWarning)
+            previewPlugin->changeElideWarning(true);
+
         auto testLanguages = [previewPlugin, runControl, testLanguageList](int timerCounter, const QString &previewedFile) {
-            qDebug() << "testLanguages" << previewedFile;
             for (auto language : testLanguageList) {
                 QTimer::singleShot(timerCounter * 1000, previewPlugin, [previewPlugin, runControl, language, previewedFile]() {
                     if (runControl && runControl->isRunning()) {
                         if (!previewedFile.isEmpty())
                             previewPlugin->setPreviewedFile(previewedFile);
-                        previewPlugin->setLocale(language);
+                        previewPlugin->setLocaleIsoCode(language);
                     }
                 });
             }
@@ -319,7 +319,7 @@ void QmlDebugTranslationWidget::runTest()
         //delete m_currentRunControl; // who deletes the runcontrol?
         m_currentRunControl = nullptr;
         if (auto previewPlugin = qobject_cast<Internal::QmlPreviewPlugin*>(getPreviewPlugin()))
-            previewPlugin->setLocale(m_lastUsedLanguageBeforeTest);
+            previewPlugin->setLocaleIsoCode(m_lastUsedLanguageBeforeTest);
     });
 
     connect(runControl, &ProjectExplorer::RunControl::appendMessage,
@@ -332,7 +332,7 @@ void QmlDebugTranslationWidget::runTest()
             if (auto runConfiguration = target->activeRunConfiguration()) {
                 runControl->setRunConfiguration(runConfiguration);
                 if (runControl->createMainWorker()) {
-                    previewPlugin->setLocale(QString());
+                    previewPlugin->setLocaleIsoCode(QString());
                     runControl->initiateStart();
                 }
             }
@@ -399,7 +399,7 @@ void QmlDebugTranslationWidget::appendMessage(const QString &message, Utils::Out
         return;
     }
     const QString serviceSeperator = ": QQmlDebugTranslationService: ";
-    if (!message.contains(serviceSeperator) || message.contains("DebugTranslation service - language changed"))
+    if (!message.contains(serviceSeperator))
         return;
     QString locationString = message;
     locationString = locationString.split(serviceSeperator).first();
@@ -449,4 +449,19 @@ QString QmlDebugTranslationWidget::runButtonText(bool isRunning)
     return tr("Run language tests");
 }
 
+void QmlDebugTranslationWidget::addLanguageCheckBoxes(const QStringList &languages)
+{
+    for (auto language : languages) {
+        auto languageCheckBox = new QCheckBox(language);
+        m_selectLanguageLayout->addWidget(languageCheckBox);
+        connect(languageCheckBox, &QCheckBox::stateChanged, [this, language] (int state) {
+            if (state == Qt::Checked)
+                m_testLanguages.append(language);
+            else
+                m_testLanguages.removeAll(language);
+        });
+        languageCheckBox->setChecked(true);
+    }
+}
+
 } // namespace QmlPreview
diff --git a/src/plugins/qmlpreview/qmldebugtranslationwidget.h b/src/plugins/qmlpreview/qmldebugtranslationwidget.h
index 944c7a59b93..7ea0760ac0f 100644
--- a/src/plugins/qmlpreview/qmldebugtranslationwidget.h
+++ b/src/plugins/qmlpreview/qmldebugtranslationwidget.h
@@ -51,11 +51,13 @@ namespace QmlPreview {
 
 class ProjectFileSelectionsWidget;
 
+
 class QMLPREVIEW_EXPORT QmlDebugTranslationWidget : public QWidget
 {
+    using TestLanguageGetter = std::function<QStringList()>;
     Q_OBJECT
 public:
-    explicit QmlDebugTranslationWidget(QWidget *parent = nullptr);
+    explicit QmlDebugTranslationWidget(QWidget *parent = nullptr, TestLanguageGetter languagesGetterMethod = {});
     ~QmlDebugTranslationWidget() override;
 
     void setCurrentFile(const Utils::FilePath &filepath);
@@ -75,6 +77,7 @@ private:
 
     QString singleFileButtonText(const QString &filePath);
     QString runButtonText(bool isRunning = false);
+    void addLanguageCheckBoxes(const QStringList &languages);
 
     QStringList m_testLanguages;
     QString m_lastUsedLanguageBeforeTest;
@@ -94,6 +97,7 @@ private:
     QString m_lastDir;
 
     QHBoxLayout *m_selectLanguageLayout;
+    TestLanguageGetter m_testLanguagesGetter;
 };
 
 } // namespace QmlPreview
diff --git a/src/plugins/qmlpreview/qmlpreviewclient.cpp b/src/plugins/qmlpreview/qmlpreviewclient.cpp
index ae89d75d4aa..6580833810c 100644
--- a/src/plugins/qmlpreview/qmlpreviewclient.cpp
+++ b/src/plugins/qmlpreview/qmlpreviewclient.cpp
@@ -56,13 +56,6 @@ void QmlPreviewClient::zoom(float zoomFactor)
     sendMessage(packet.data());
 }
 
-void QmlPreviewClient::language(const QUrl &context, const QString &locale)
-{
-    QmlDebug::QPacket packet(dataStreamVersion());
-    packet << static_cast<qint8>(Language) << context << locale;
-    sendMessage(packet.data());
-}
-
 void QmlPreviewClient::announceFile(const QString &path, const QByteArray &contents)
 {
     QmlDebug::QPacket packet(dataStreamVersion());
diff --git a/src/plugins/qmlpreview/qmlpreviewclient.h b/src/plugins/qmlpreview/qmlpreviewclient.h
index 4e84f6b3ee5..fdb7e3cd63e 100644
--- a/src/plugins/qmlpreview/qmlpreviewclient.h
+++ b/src/plugins/qmlpreview/qmlpreviewclient.h
@@ -43,8 +43,7 @@ public:
         Directory,
         ClearCache,
         Zoom,
-        Fps,
-        Language
+        Fps
     };
 
     struct FpsInfo {
@@ -64,7 +63,6 @@ public:
     void loadUrl(const QUrl &url);
     void rerun();
     void zoom(float zoomFactor);
-    void language(const QUrl &context, const QString &locale);
     void announceFile(const QString &path, const QByteArray &contents);
     void announceDirectory(const QString &path, const QStringList &entries);
     void announceError(const QString &path);
diff --git a/src/plugins/qmlpreview/qmlpreviewconnectionmanager.cpp b/src/plugins/qmlpreview/qmlpreviewconnectionmanager.cpp
index 7da4bdea13f..ca125908ad3 100644
--- a/src/plugins/qmlpreview/qmlpreviewconnectionmanager.cpp
+++ b/src/plugins/qmlpreview/qmlpreviewconnectionmanager.cpp
@@ -36,16 +36,14 @@
 namespace QmlPreview {
 namespace Internal {
 
-QmlPreviewConnectionManager::~QmlPreviewConnectionManager()
-{
-}
-
 QmlPreviewConnectionManager::QmlPreviewConnectionManager(QObject *parent) :
     QmlDebug::QmlDebugConnectionManager(parent)
 {
     setTarget(nullptr);
 }
 
+QmlPreviewConnectionManager::~QmlPreviewConnectionManager() = default;
+
 void QmlPreviewConnectionManager::setTarget(ProjectExplorer::Target *target)
 {
     QtSupport::BaseQtVersion::populateQmlFileFinder(&m_projectFileFinder, target);
@@ -117,13 +115,11 @@ void QmlPreviewConnectionManager::createDebugTranslationClient()
 {
     m_qmlDebugTranslationClient = new QmlDebugTranslationClient(connection());
     connect(this, &QmlPreviewConnectionManager::language,
-                     m_qmlDebugTranslationClient.data(), [this](const QString &locale) {
-
-        if (m_lastLoadedUrl.isEmpty()) {
-            // findValidI18nDirectoryAsUrl does not work if we didn't load any file
-            m_initLocale = locale;
-        } else {
-            // service expects a context URL.
+                     m_qmlDebugTranslationClient, [this](const QString &locale) {
+        m_lastUsedLanguage = locale;
+        // findValidI18nDirectoryAsUrl does not work if we didn't load any file
+        // service expects a context URL.
+        if (!m_lastLoadedUrl.isEmpty()) {
             // Search the parent directories of the last loaded URL for i18n files.
             m_qmlDebugTranslationClient->changeLanguage(findValidI18nDirectoryAsUrl(locale), locale);
         }
@@ -159,10 +155,9 @@ void QmlPreviewConnectionManager::createPreviewClient()
 
         m_lastLoadedUrl = m_targetFileFinder.findUrl(filename);
         m_qmlPreviewClient->loadUrl(m_lastLoadedUrl);
-        if (!m_initLocale.isEmpty()) {
-            emit language(m_initLocale);
-            m_initLocale.clear();
-        }
+        // emit language after a file was loaded and do it every time,
+        // because this also triggers the check for missing translations
+        emit language(m_lastUsedLanguage);
     });
 
     connect(this, &QmlPreviewConnectionManager::rerun,
@@ -171,19 +166,6 @@ void QmlPreviewConnectionManager::createPreviewClient()
     connect(this, &QmlPreviewConnectionManager::zoom,
                      m_qmlPreviewClient.data(), &QmlPreviewClient::zoom);
 
-    connect(this, &QmlPreviewConnectionManager::language,
-                     m_qmlPreviewClient.data(), [this](const QString &locale) {
-
-        if (m_lastLoadedUrl.isEmpty()) {
-            // findValidI18nDirectoryAsUrl does not work if we didn't load any file
-            m_initLocale = locale;
-        } else {
-            // service expects a context URL.
-            // Search the parent directories of the last loaded URL for i18n files.
-            m_qmlPreviewClient->language(findValidI18nDirectoryAsUrl(locale), locale);
-        }
-    });
-
     connect(m_qmlPreviewClient.data(), &QmlPreviewClient::pathRequested,
                      this, [this](const QString &path) {
         const bool found = m_projectFileFinder.findFileOrDirectory(
diff --git a/src/plugins/qmlpreview/qmlpreviewconnectionmanager.h b/src/plugins/qmlpreview/qmlpreviewconnectionmanager.h
index 7693eda6950..c63db57343c 100644
--- a/src/plugins/qmlpreview/qmlpreviewconnectionmanager.h
+++ b/src/plugins/qmlpreview/qmlpreviewconnectionmanager.h
@@ -76,10 +76,10 @@ private:
     QPointer<QmlDebugTranslationClient> m_qmlDebugTranslationClient;
     Utils::FileSystemWatcher m_fileSystemWatcher;
     QUrl m_lastLoadedUrl;
+    QString m_lastUsedLanguage;
     QmlPreviewFileLoader m_fileLoader = nullptr;
     QmlPreviewFileClassifier m_fileClassifier = nullptr;
     QmlPreviewFpsHandler m_fpsHandler = nullptr;
-    QString m_initLocale;
 };
 
 } // namespace Internal
diff --git a/src/plugins/qmlpreview/qmlpreviewplugin.cpp b/src/plugins/qmlpreview/qmlpreviewplugin.cpp
index ffae9a1815a..f331d96b502 100644
--- a/src/plugins/qmlpreview/qmlpreviewplugin.cpp
+++ b/src/plugins/qmlpreview/qmlpreviewplugin.cpp
@@ -150,8 +150,8 @@ public:
     QmlPreview::QmlPreviewFileClassifier m_fileClassifer = nullptr;
     float m_zoomFactor = -1.0;
     QmlPreview::QmlPreviewFpsHandler m_fpsHandler = nullptr;
-    QString m_locale;
-    bool elideWarning = false;
+    QString m_localeIsoCode;
+    bool m_translationElideWarning = false;
     QPointer<QmlDebugTranslationWidget> m_qmlDebugTranslationWidget;
 
     RunWorkerFactory localRunWorkerFactory{
@@ -163,8 +163,15 @@ public:
 
     RunWorkerFactory runWorkerFactory{
         [this](RunControl *runControl) {
-            QmlPreviewRunner *runner = new QmlPreviewRunner(runControl, m_fileLoader, m_fileClassifer,
-                                                            m_fpsHandler, m_zoomFactor);
+            QmlPreviewRunner *runner = new QmlPreviewRunner(QmlPreviewRunnerSetting{
+                runControl,
+                m_fileLoader,
+                m_fileClassifer,
+                m_fpsHandler,
+                m_zoomFactor,
+                m_localeIsoCode,
+                m_translationElideWarning
+            });
             connect(q, &QmlPreviewPlugin::updatePreviews,
                     runner, &QmlPreviewRunner::loadFile);
             connect(q, &QmlPreviewPlugin::rerunPreviews,
@@ -173,7 +180,7 @@ public:
                     this, &QmlPreviewPluginPrivate::previewCurrentFile);
             connect(q, &QmlPreviewPlugin::zoomFactorChanged,
                     runner, &QmlPreviewRunner::zoom);
-            connect(q, &QmlPreviewPlugin::localeChanged,
+            connect(q, &QmlPreviewPlugin::localeIsoCodeChanged,
                     runner, &QmlPreviewRunner::language);
             connect(q, &QmlPreviewPlugin::elideWarningChanged,
                     runner, &QmlPreviewRunner::changeElideWarning);
@@ -207,7 +214,7 @@ QmlPreviewPluginPrivate::QmlPreviewPluginPrivate(QmlPreviewPlugin *parent)
             &QAction::setEnabled);
     connect(action, &QAction::triggered, this, [this]() {
         if (auto multiLanguageAspect = QmlProjectManager::QmlMultiLanguageAspect::current())
-            m_locale = multiLanguageAspect->currentLocale();
+            m_localeIsoCode = multiLanguageAspect->currentLocale();
 
         ProjectExplorerPlugin::runStartupProject(Constants::QML_PREVIEW_RUN_MODE);
     });
@@ -387,30 +394,31 @@ void QmlPreviewPlugin::setFpsHandler(QmlPreviewFpsHandler fpsHandler)
     emit fpsHandlerChanged(d->m_fpsHandler);
 }
 
-QString QmlPreviewPlugin::locale() const
+QString QmlPreviewPlugin::localeIsoCode() const
 {
-    return d->m_locale;
+    return d->m_localeIsoCode;
 }
 
-void QmlPreviewPlugin::setLocale(const QString &locale)
+void QmlPreviewPlugin::setLocaleIsoCode(const QString &localeIsoCode)
 {
     if (auto multiLanguageAspect = QmlProjectManager::QmlMultiLanguageAspect::current())
-        multiLanguageAspect->setCurrentLocale(locale);
-    if (d->m_locale == locale)
+        multiLanguageAspect->setCurrentLocale(localeIsoCode);
+    if (d->m_localeIsoCode == localeIsoCode)
         return;
 
-    d->m_locale = locale;
-    emit localeChanged(d->m_locale);
+    d->m_localeIsoCode = localeIsoCode;
+    emit localeIsoCodeChanged(d->m_localeIsoCode);
 }
 
 bool QmlPreviewPlugin::elideWarning() const
 {
-    return d->elideWarning;
+    return d->m_translationElideWarning;
 }
 
 void QmlPreviewPlugin::changeElideWarning(bool elideWarning)
 {
-    d->elideWarning = elideWarning;
+    d->m_translationElideWarning = elideWarning;
+    emit elideWarningChanged(elideWarning);
 }
 
 void QmlPreviewPlugin::setFileLoader(QmlPreviewFileLoader fileLoader)
diff --git a/src/plugins/qmlpreview/qmlpreviewplugin.h b/src/plugins/qmlpreview/qmlpreviewplugin.h
index 13146105ac9..b2455b10773 100644
--- a/src/plugins/qmlpreview/qmlpreviewplugin.h
+++ b/src/plugins/qmlpreview/qmlpreviewplugin.h
@@ -58,7 +58,7 @@ class QmlPreviewPlugin : public ExtensionSystem::IPlugin
     Q_PROPERTY(QmlPreview::QmlPreviewFpsHandler fpsHandler READ fpsHandler
                WRITE setFpsHandler NOTIFY fpsHandlerChanged)
     Q_PROPERTY(float zoomFactor READ zoomFactor WRITE setZoomFactor NOTIFY zoomFactorChanged)
-    Q_PROPERTY(QString locale READ locale WRITE setLocale NOTIFY localeChanged)
+    Q_PROPERTY(QString localeIsoCode READ localeIsoCode WRITE setLocaleIsoCode NOTIFY localeIsoCodeChanged)
     Q_PROPERTY(bool elideWarning READ elideWarning WRITE changeElideWarning NOTIFY elideWarningChanged)
 
 public:
@@ -84,8 +84,8 @@ public:
     QmlPreview::QmlPreviewFpsHandler fpsHandler() const;
     void setFpsHandler(QmlPreview::QmlPreviewFpsHandler fpsHandler);
 
-    QString locale() const;
-    void setLocale(const QString &locale);
+    QString localeIsoCode() const;
+    void setLocaleIsoCode(const QString &localeIsoCode);
 
     bool elideWarning() const;
     void changeElideWarning(bool elideWarning);
@@ -103,7 +103,7 @@ signals:
     void fpsHandlerChanged(QmlPreview::QmlPreviewFpsHandler fpsHandler);
 
     void zoomFactorChanged(float zoomFactor);
-    void localeChanged(const QString &locale);
+    void localeIsoCodeChanged(const QString &localeIsoCode);
     void elideWarningChanged(bool elideWarning);
 
 private:
diff --git a/src/plugins/qmlpreview/qmlpreviewruncontrol.cpp b/src/plugins/qmlpreview/qmlpreviewruncontrol.cpp
index 518e33794fb..a1b667b78b2 100644
--- a/src/plugins/qmlpreview/qmlpreviewruncontrol.cpp
+++ b/src/plugins/qmlpreview/qmlpreviewruncontrol.cpp
@@ -45,17 +45,13 @@ namespace QmlPreview {
 
 static const QString QmlServerUrl = "QmlServerUrl";
 
-QmlPreviewRunner::QmlPreviewRunner(ProjectExplorer::RunControl *runControl,
-                                   QmlPreviewFileLoader fileLoader,
-                                   QmlPreviewFileClassifier fileClassifier,
-                                   QmlPreviewFpsHandler fpsHandler,
-                                   float initialZoom)
-    : RunWorker(runControl)
+QmlPreviewRunner::QmlPreviewRunner(const QmlPreviewRunnerSetting &settings)
+    : RunWorker(settings.runControl)
 {
     setId("QmlPreviewRunner");
-    m_connectionManager.setFileLoader(fileLoader);
-    m_connectionManager.setFileClassifier(fileClassifier);
-    m_connectionManager.setFpsHandler(fpsHandler);
+    m_connectionManager.setFileLoader(settings.fileLoader);
+    m_connectionManager.setFileClassifier(settings.fileClassifier);
+    m_connectionManager.setFpsHandler(settings.fpsHandler);
 
     connect(this, &QmlPreviewRunner::loadFile,
             &m_connectionManager, &Internal::QmlPreviewConnectionManager::loadFile);
@@ -70,24 +66,29 @@ QmlPreviewRunner::QmlPreviewRunner(ProjectExplorer::RunControl *runControl,
             &m_connectionManager, &Internal::QmlPreviewConnectionManager::changeElideWarning);
 
     connect(&m_connectionManager, &Internal::QmlPreviewConnectionManager::connectionOpened,
-            this, [this, initialZoom]() {
-        if (initialZoom > 0)
-            emit zoom(initialZoom);
+            this, [this, settings]() {
+        if (settings.zoom > 0)
+            emit zoom(settings.zoom);
+        if (!settings.language.isEmpty())
+            emit language(settings.language);
+        if (settings.translationElideWarning)
+            emit changeElideWarning(true);
+
         emit ready();
     });
 
     connect(&m_connectionManager, &Internal::QmlPreviewConnectionManager::restart,
-            runControl, [this, runControl]() {
-        if (!runControl->isRunning())
+            runControl(), [this]() {
+        if (!runControl()->isRunning())
             return;
 
-        this->connect(runControl, &ProjectExplorer::RunControl::stopped, runControl, [runControl]() {
+        this->connect(runControl(), &ProjectExplorer::RunControl::stopped, [this]() {
             ProjectExplorer::ProjectExplorerPlugin::runRunConfiguration(
-                        runControl->runConfiguration(),
+                        runControl()->runConfiguration(),
                         ProjectExplorer::Constants::QML_PREVIEW_RUN_MODE, true);
         });
 
-        runControl->initiateStop();
+        runControl()->initiateStop();
     });
 }
 
diff --git a/src/plugins/qmlpreview/qmlpreviewruncontrol.h b/src/plugins/qmlpreview/qmlpreviewruncontrol.h
index 38740b31a39..c5171e22488 100644
--- a/src/plugins/qmlpreview/qmlpreviewruncontrol.h
+++ b/src/plugins/qmlpreview/qmlpreviewruncontrol.h
@@ -32,14 +32,22 @@
 
 namespace QmlPreview {
 
+struct QmlPreviewRunnerSetting {
+    ProjectExplorer::RunControl *runControl = nullptr;
+    QmlPreviewFileLoader fileLoader;
+    QmlPreviewFileClassifier fileClassifier;
+    QmlPreviewFpsHandler fpsHandler;
+    float zoom = 1.0;
+    QString language;
+    bool translationElideWarning = false;
+};
+
 class QmlPreviewRunner : public ProjectExplorer::RunWorker
 {
     Q_OBJECT
 
 public:
-    QmlPreviewRunner(ProjectExplorer::RunControl *runControl, QmlPreviewFileLoader fileLoader,
-                     QmlPreviewFileClassifier fileClassifier, QmlPreviewFpsHandler fpsHandler,
-                     float initialZoom);
+    QmlPreviewRunner(const QmlPreviewRunnerSetting &settings);
 
     void setServerUrl(const QUrl &serverUrl);
     QUrl serverUrl() const;
diff --git a/src/plugins/qmlpreview/tests/qmlpreviewclient_test.cpp b/src/plugins/qmlpreview/tests/qmlpreviewclient_test.cpp
index 12d8f317288..9aec2d6cc66 100644
--- a/src/plugins/qmlpreview/tests/qmlpreviewclient_test.cpp
+++ b/src/plugins/qmlpreview/tests/qmlpreviewclient_test.cpp
@@ -91,24 +91,6 @@ void QmlPreviewClientTest::testZoom()
     QVERIFY(packet.atEnd());
 }
 
-void QmlPreviewClientTest::testLanguate()
-{
-    TestableQmlPreviewClient client;
-    QUrl url("file:///some/file.qml");
-    QString locale("qt_QT");
-    client.language(url, locale);
-    QCOMPARE(client.messages.count(), 1);
-    QmlDebug::QPacket packet(client.dataStreamVersion(), client.messages.takeFirst());
-    qint8 command;
-    QUrl resultUrl;
-    QString resultLocale;
-    packet >> command >> resultUrl >> resultLocale;
-    QCOMPARE(static_cast<QmlPreviewClient::Command>(command), QmlPreviewClient::Language);
-    QCOMPARE(resultUrl, url);
-    QCOMPARE(resultLocale, locale);
-    QVERIFY(packet.atEnd());
-}
-
 void QmlPreviewClientTest::testMessageReceived()
 {
     TestableQmlPreviewClient client;
diff --git a/src/plugins/qmlpreview/tests/qmlpreviewclient_test.h b/src/plugins/qmlpreview/tests/qmlpreviewclient_test.h
index e5e1ad089e6..43ae0030036 100644
--- a/src/plugins/qmlpreview/tests/qmlpreviewclient_test.h
+++ b/src/plugins/qmlpreview/tests/qmlpreviewclient_test.h
@@ -36,7 +36,6 @@ private slots:
     void testLoadFile();
     void testAnnounceFile();
     void testZoom();
-    void testLanguate();
     void testMessageReceived();
 };
 
diff --git a/src/plugins/qmlpreview/tests/qmlpreviewplugin_test.cpp b/src/plugins/qmlpreview/tests/qmlpreviewplugin_test.cpp
index 9ca2f38b08d..0e3306f15df 100644
--- a/src/plugins/qmlpreview/tests/qmlpreviewplugin_test.cpp
+++ b/src/plugins/qmlpreview/tests/qmlpreviewplugin_test.cpp
@@ -78,21 +78,6 @@ void QmlPreviewPluginTest::testZoomFactorProperty()
     QCOMPARE(spy.count(), 2);
 }
 
-void QmlPreviewPluginTest::testLocaleProperty()
-{
-    ExtensionSystem::IPlugin *plugin = getPlugin();
-    QVERIFY(plugin);
-
-    QSignalSpy spy(plugin, SIGNAL(localeChanged(QString)));
-
-    QCOMPARE(plugin->property("locale").toString(), QString());
-    plugin->setProperty("locale", "de_DE");
-    QCOMPARE(plugin->property("locale").toString(), QString("de_DE"));
-    plugin->setProperty("locale", "qt_QT");
-    QCOMPARE(plugin->property("locale").toString(), QString("qt_QT"));
-    QCOMPARE(spy.count(), 2);
-}
-
 void QmlPreviewPluginTest::testFpsHandlerProperty()
 {
     ExtensionSystem::IPlugin *plugin = getPlugin();
diff --git a/src/plugins/qmlpreview/tests/qmlpreviewplugin_test.h b/src/plugins/qmlpreview/tests/qmlpreviewplugin_test.h
index ce3cef1dfcc..8ceeb6669ca 100644
--- a/src/plugins/qmlpreview/tests/qmlpreviewplugin_test.h
+++ b/src/plugins/qmlpreview/tests/qmlpreviewplugin_test.h
@@ -42,7 +42,6 @@ public:
 private slots:
     void testFileLoaderProperty();
     void testZoomFactorProperty();
-    void testLocaleProperty();
     void testFpsHandlerProperty();
 };