diff --git a/src/plugins/coreplugin/coreimpl.cpp b/src/plugins/coreplugin/coreimpl.cpp
index 5a8619ab3a3dbc3c8d4b77c224923216b86d057f..1628bea8246b04b1f8afa110cdde0cbb0ee2072e 100644
--- a/src/plugins/coreplugin/coreimpl.cpp
+++ b/src/plugins/coreplugin/coreimpl.cpp
@@ -164,6 +164,11 @@ QPrinter *CoreImpl::printer() const
     return m_mainwindow->printer();
 }
 
+QString CoreImpl::userInterfaceLanguage() const
+{
+    return qApp->property("qtc_locale").toString();
+}
+
 #ifdef Q_OS_MAC
 #  define SHARE_PATH "/../Resources"
 #else
diff --git a/src/plugins/coreplugin/coreimpl.h b/src/plugins/coreplugin/coreimpl.h
index e8e114cbbabb5c16c9ba523b8e03d0b8b57b82c3..4fd1149e80f66266c14a5305a239d9d72f6f9e20 100644
--- a/src/plugins/coreplugin/coreimpl.h
+++ b/src/plugins/coreplugin/coreimpl.h
@@ -72,6 +72,7 @@ public:
     QSettings *settings(QSettings::Scope scope = QSettings::UserScope) const;
     SettingsDatabase *settingsDatabase() const;
     QPrinter *printer() const;
+    QString userInterfaceLanguage() const;
 
     QString resourcePath() const;
     QString userResourcePath() const;
diff --git a/src/plugins/coreplugin/icore.h b/src/plugins/coreplugin/icore.h
index c914a3c8e83eff771223d1c344d477dd9eab14eb..174a0d3f1bc15b92d5ef51fa4c5566925c669191 100644
--- a/src/plugins/coreplugin/icore.h
+++ b/src/plugins/coreplugin/icore.h
@@ -101,6 +101,7 @@ public:
     virtual QSettings *settings(QSettings::Scope scope = QSettings::UserScope) const = 0;
     virtual SettingsDatabase *settingsDatabase() const = 0;
     virtual QPrinter *printer() const = 0;
+    virtual QString userInterfaceLanguage() const = 0;
 
     virtual QString resourcePath() const = 0;
     virtual QString userResourcePath() const = 0;
diff --git a/src/plugins/designer/formeditorplugin.cpp b/src/plugins/designer/formeditorplugin.cpp
index ea7c04cac7894c3d1da6af85b3cf0cc4637a6dbd..1c10c422ab061c2a6c4a5867db3a5e4a47d88d60 100644
--- a/src/plugins/designer/formeditorplugin.cpp
+++ b/src/plugins/designer/formeditorplugin.cpp
@@ -86,7 +86,7 @@ bool FormEditorPlugin::initialize(const QStringList &arguments, QString *error)
     addAutoReleasedObject(new FormEditorFactory);
 
     // Ensure that loading designer translations is done before FormEditorW is instantiated
-    const QString locale = qApp->property("qtc_locale").toString();
+    const QString locale = Core::ICore::instance()->userInterfaceLanguage();
     if (!locale.isEmpty()) {
         QTranslator *qtr = new QTranslator(this);
         const QString &creatorTrPath =
diff --git a/src/plugins/help/helpplugin.cpp b/src/plugins/help/helpplugin.cpp
index a50d1c46eb988a5dd53f74949700bb2373ebbac8..5a7b6fe567082c19c473093070636612b5d86302 100644
--- a/src/plugins/help/helpplugin.cpp
+++ b/src/plugins/help/helpplugin.cpp
@@ -151,7 +151,7 @@ bool HelpPlugin::initialize(const QStringList &arguments, QString *error)
     Core::Context globalcontext(Core::Constants::C_GLOBAL);
     Core::Context modecontext(Constants::C_MODE_HELP);
 
-    const QString &locale = qApp->property("qtc_locale").toString();
+    const QString &locale = m_core->userInterfaceLanguage();
     if (!locale.isEmpty()) {
         QTranslator *qtr = new QTranslator(this);
         QTranslator *qhelptr = new QTranslator(this);
diff --git a/src/plugins/projectexplorer/customwizard/customwizardparameters.cpp b/src/plugins/projectexplorer/customwizard/customwizardparameters.cpp
index d1b3662235cb772bc0e92f9cb46576c95e2f46ec..8a908c360525130e9243795d467356470dd8355e 100644
--- a/src/plugins/projectexplorer/customwizard/customwizardparameters.cpp
+++ b/src/plugins/projectexplorer/customwizard/customwizardparameters.cpp
@@ -507,10 +507,9 @@ static inline QString attributeValue(const QXmlStreamReader &r, const char *name
 }
 
 // Return locale language attribute "de_UTF8" -> "de", empty string for "C"
-static inline QString localeLanguage()
+static inline QString languageSetting()
 {
-    QLocale loc;
-    QString name = loc.name();
+    QString name = Core::ICore::instance()->userInterfaceLanguage();
     const int underScorePos = name.indexOf(QLatin1Char('_'));
     if (underScorePos != -1)
         name.truncate(underScorePos);
@@ -538,7 +537,7 @@ CustomWizardParameters::ParseResult
     clear();
     bp->clear();
     bp->setKind(Core::IWizard::ProjectWizard);
-    const QString language = localeLanguage();
+    const QString language = languageSetting();
     CustomWizardField field;
     do {
         token = reader.readNext();