Gui: fix algorithmic issue in language change

If number format mode is "Selected language", even if this mode isn't modified,
 we need to force 'setLocale' to update if "Language" has been changed

src/Gui/DlgGeneralImp.cpp

@@ -120,7 +120,7 @@ void DlgGeneralImp::setRecentFileSize()
     }
 }
 
-void DlgGeneralImp::setLanguage()
+bool DlgGeneralImp::setLanguage()
 {
     ParameterGrp::handle hGrp = WindowParameter::getDefaultParameter()->GetGroup("General");
     QString lang = QLocale::languageToString(QLocale().language());
@@ -129,15 +129,17 @@ void DlgGeneralImp::setLanguage()
     if (current != language) {
         hGrp->SetASCII("Language", current.constData());
         Translator::instance()->activateLanguage(current.constData());
+        return true;
     }
+    return false;
 }
 
-void DlgGeneralImp::setNumberLocale()
+void DlgGeneralImp::setNumberLocale(bool force/* = false*/)
 {
     int localeFormat = ui->UseLocaleFormatting->currentIndex();
 
     // Only make the change if locale setting has changed
-    if (localeIndex == localeFormat)
+    if (!force && localeIndex == localeFormat)
         return;
 
     if (localeFormat == 0) {
@@ -167,8 +169,9 @@ void DlgGeneralImp::saveSettings()
     ui->SplashScreen->onSave();
 
     setRecentFileSize();
-    setLanguage();
-    setNumberLocale();
+    bool force = setLanguage();
+    // In case type is "Selected language", we need to force locale change
+    setNumberLocale(force);
 
     ParameterGrp::handle hGrp = WindowParameter::getDefaultParameter()->GetGroup("General");
     QVariant size = ui->toolbarIconSize->itemData(ui->toolbarIconSize->currentIndex());

src/Gui/DlgGeneralImp.h

@@ -64,8 +64,8 @@ private:
     void setRecentFileSize();
     void saveAsNewPreferencePack();
     void revertToSavedConfig();
-    void setLanguage();
-    void setNumberLocale();
+    bool setLanguage(); //Returns true if language has been changed
+    void setNumberLocale(bool force = false);
 
 private:
     int localeIndex;