diff --git a/sources/ElementsCollection/elementcollectionhandler.cpp b/sources/ElementsCollection/elementcollectionhandler.cpp
index d295ea39d..378ed0757 100644
--- a/sources/ElementsCollection/elementcollectionhandler.cpp
+++ b/sources/ElementsCollection/elementcollectionhandler.cpp
@@ -44,7 +44,7 @@ ECHSFileToFile::ECHSFileToFile(ElementsLocation &source, ElementsLocation &desti
 ElementsLocation ECHSFileToFile::copy()
 {
 	//Check if the destination already have an item with the same name of the item to copy
-	ElementsLocation location(m_destination.fileSystemPath() + "/" + m_source.fileName());
+	ElementsLocation location(m_destination.fileSystemPath() % "/" % m_source.fileName());
 	QString rename;
 	if (location.exist())
 	{
@@ -92,10 +92,10 @@ ElementsLocation ECHSFileToFile::copyDirectory(ElementsLocation &source, Element
 	if (destination_dir.mkdir(new_dir_name))
 	{
 		//The new created directory
-		QDir created_dir(destination_dir.canonicalPath() + "/" + new_dir_name);
+		QDir created_dir(destination_dir.canonicalPath() % "/" % new_dir_name);
 		
 		//Copy the qet_directory file
-		QFile::copy(source_dir.canonicalPath() + "/qet_directory", created_dir.canonicalPath() + "/qet_directory");
+		QFile::copy(source_dir.canonicalPath() % "/qet_directory", created_dir.canonicalPath() % "/qet_directory");
 		
 		//Copy all dirs found in source_dir to destination_dir
 		ElementsLocation created_location(created_dir.canonicalPath());
@@ -115,7 +115,7 @@ ElementsLocation ECHSFileToFile::copyDirectory(ElementsLocation &source, Element
 				}
 			}
 
-			ElementsLocation sub_source(source.fileSystemPath() + "/" + str);
+			ElementsLocation sub_source(source.fileSystemPath() % "/" % str);
 			copyDirectory(sub_source, created_location);
 		}
 
@@ -123,7 +123,7 @@ ElementsLocation ECHSFileToFile::copyDirectory(ElementsLocation &source, Element
 		source_dir.setNameFilters(QStringList() << "*.elmt");
 		foreach(QString str, source_dir.entryList(QDir::Files | QDir::NoDotAndDotDot, QDir::Name))
 		{
-			ElementsLocation sub_source(source.fileSystemPath() + "/" + str);
+			ElementsLocation sub_source(source.fileSystemPath() % "/" % str);
 			copyElement(sub_source, created_location);
 		}
 		
@@ -136,7 +136,7 @@ ElementsLocation ECHSFileToFile::copyDirectory(ElementsLocation &source, Element
 ElementsLocation ECHSFileToFile::copyElement(ElementsLocation &source, ElementsLocation &destination, const QString& rename)
 {
 	QString new_elmt_name = rename.isEmpty() ? source.fileName() : rename;
-	bool rb = QFile::copy(source.fileSystemPath(), destination.fileSystemPath() + "/" + new_elmt_name);
+	bool rb = QFile::copy(source.fileSystemPath(), destination.fileSystemPath() % "/" % new_elmt_name);
 	if (rb)
 	{
 #ifdef Q_OS_WIN
@@ -145,7 +145,7 @@ ElementsLocation ECHSFileToFile::copyElement(ElementsLocation &source, ElementsL
 		//user can't save the element
 		extern Q_CORE_EXPORT int qt_ntfs_permission_lookup;
 		qt_ntfs_permission_lookup++;
-		QFile file(destination.fileSystemPath() + "/" + new_elmt_name);
+		QFile file(destination.fileSystemPath() % "/" % new_elmt_name);
 		if (!file.isWritable()) {
 			if (!file.setPermissions(file.permissions() | QFileDevice::WriteUser)) {
 				qDebug() << "Failed to change file permission of : " << QFileInfo(file).canonicalFilePath() \
@@ -154,7 +154,7 @@ ElementsLocation ECHSFileToFile::copyElement(ElementsLocation &source, ElementsL
 		}
 		qt_ntfs_permission_lookup--;
 #endif
-		return ElementsLocation (destination.fileSystemPath() + "/" + new_elmt_name);
+		return ElementsLocation (destination.fileSystemPath() % "/" % new_elmt_name);
 	}
 	else
 		return ElementsLocation();
@@ -169,7 +169,7 @@ ECHSXmlToFile::ECHSXmlToFile(ElementsLocation &source, ElementsLocation &destina
 ElementsLocation ECHSXmlToFile::copy()
 {
 	//Check if the destination already have an item with the same name of the item to copy
-	ElementsLocation location(m_destination.fileSystemPath() + "/" + m_source.fileName());
+	ElementsLocation location(m_destination.fileSystemPath() % "/" % m_source.fileName());
 	QString rename;
 	if (location.exist())
 	{
@@ -215,7 +215,7 @@ ElementsLocation ECHSXmlToFile::copyDirectory(ElementsLocation &source, Elements
 	//Create new dir
 	if (destination_dir.mkdir(new_dir_name))
 	{
-		QDir created_dir(destination_dir.canonicalPath() + "/" + new_dir_name);
+		QDir created_dir(destination_dir.canonicalPath() % "/" % new_dir_name);
 		ElementsLocation created_location(created_dir.canonicalPath());
 		
 		//Create the qet-directory file
@@ -224,7 +224,7 @@ ElementsLocation ECHSXmlToFile::copyDirectory(ElementsLocation &source, Elements
 		document.appendChild(root);
 		root.appendChild(source.nameList().toXml(document));
 		
-		QString filepath = created_dir.canonicalPath() + "/qet_directory";
+		QString filepath = created_dir.canonicalPath() % "/qet_directory";
 		QET::writeXmlFile(document, filepath);
 		
 		//Create all directory found in source to created_dir
@@ -233,7 +233,7 @@ ElementsLocation ECHSXmlToFile::copyDirectory(ElementsLocation &source, Elements
 		QStringList directories_names = project_collection->directoriesNames( project_collection->directory(source.collectionPath(false)) );
 		foreach(QString name, directories_names)
 		{
-			ElementsLocation sub_source_dir(source.projectCollectionPath() + "/" + name);
+			ElementsLocation sub_source_dir(source.projectCollectionPath() % "/" % name);
 			copyDirectory(sub_source_dir,  created_location);
 		}
 		
@@ -241,7 +241,7 @@ ElementsLocation ECHSXmlToFile::copyDirectory(ElementsLocation &source, Elements
 		QStringList elements_names = project_collection->elementsNames( project_collection->directory(source.collectionPath(false))) ;
 		foreach (QString name, elements_names)
 		{
-			ElementsLocation source_element(source.projectCollectionPath() + "/" + name);
+			ElementsLocation source_element(source.projectCollectionPath() % "/" % name);
 			copyElement(source_element, created_location);
 		}
 		
@@ -262,7 +262,7 @@ ElementsLocation ECHSXmlToFile::copyElement(ElementsLocation &source, ElementsLo
 	document.appendChild(document.importNode(source.xml(), true));
 	
 	//Create the .elmt file
-	QString filepath = destination.fileSystemPath() + "/" + new_element_name;
+	QString filepath = destination.fileSystemPath() % "/" % new_element_name;
 	if (QET::writeXmlFile(document, filepath))
 		return ElementsLocation(filepath);
 	else
@@ -280,7 +280,7 @@ ElementsLocation ECHSToXml::copy()
 	if (!(m_source.exist() && m_destination.isDirectory() && m_destination.isProject())) return ElementsLocation();
 	
 	//Check if the destination already have an item with the same name of the item to copy
-	ElementsLocation location(m_destination.projectCollectionPath() + "/" + m_source.fileName());
+	ElementsLocation location(m_destination.projectCollectionPath() % "/" % m_source.fileName());
 	
 	QString rename;
 	if (location.exist())
@@ -370,7 +370,7 @@ ElementsLocation ElementCollectionHandler::createDir(ElementsLocation &parent, c
 			document.appendChild(root);
 			root.appendChild(name_list.toXml(document));
 			
-			QString filepath = created_dir.fileSystemPath() + "/qet_directory";
+			QString filepath = created_dir.fileSystemPath() % "/qet_directory";
 			if (!QET::writeXmlFile(document, filepath)) {
 				qDebug() << "ElementCollectionHandler::createDir : write qet-directory file failed";
 			}
diff --git a/sources/ElementsCollection/elementscollectionwidget.cpp b/sources/ElementsCollection/elementscollectionwidget.cpp
index 2ab4e9ab3..d86a35266 100644
--- a/sources/ElementsCollection/elementscollectionwidget.cpp
+++ b/sources/ElementsCollection/elementscollectionwidget.cpp
@@ -620,7 +620,7 @@ void ElementsCollectionWidget::dirProperties()
 		QMessageBox::information(
 			this,
 			tr("Propriété du dossier %1").arg(eci->localName()),
-			txt1 + " " + txt2 + " " + txt3 + "\n\n" + txt4 + "\n" + txt5);
+			txt1 % " " % txt2 % " " % txt3 % "\n\n" % txt4 % "\n" % txt5);
 		}
 }
 
diff --git a/sources/ElementsCollection/elementslocation.cpp b/sources/ElementsCollection/elementslocation.cpp
index f9c66c369..d214fbda2 100644
--- a/sources/ElementsCollection/elementslocation.cpp
+++ b/sources/ElementsCollection/elementslocation.cpp
@@ -196,9 +196,9 @@ QString ElementsLocation::projectCollectionPath() const
 		return QString();
 	else
 		return QString("project"
-				   + QString::number(QETApp::projectId(m_project))
-				   + "+"
-				   + collectionPath());
+				   % QString::number(QETApp::projectId(m_project))
+				   % "+"
+				   % collectionPath());
 }
 
 /**
@@ -296,17 +296,17 @@ void ElementsLocation::setPath(const QString &path)
 		if (path.startsWith("common://"))
 		{
 			tmp_path.remove("common://");
-			p = QETApp::commonElementsDirN() + "/" + tmp_path;
+			p = QETApp::commonElementsDirN() % "/" % tmp_path;
 		}
 		else if (path.startsWith("company://"))
 		{
 			tmp_path.remove("company://");
-			p = QETApp::companyElementsDirN() + "/" + tmp_path;
+			p = QETApp::companyElementsDirN() % "/" % tmp_path;
 		}
 		else
 		{
 			tmp_path.remove("custom://");
-			p = QETApp::customElementsDirN() + "/" + tmp_path;
+			p = QETApp::customElementsDirN() % "/" % tmp_path;
 		}
 
 		m_file_system_path = p;
@@ -464,7 +464,7 @@ QString ElementsLocation::toString() const
 	if (m_project) {
 		int project_id = QETApp::projectId(m_project);
 		if (project_id != -1) {
-			result += "project" + QString().setNum(project_id) + "+";
+			result += "project" % QString().setNum(project_id) % "+";
 		}
 	}
 	result += m_collection_path;
@@ -624,7 +624,7 @@ NamesList ElementsLocation::nameList()
 		{
 			//Open the qet_directory file,
 			// to get the traductions name of this dir
-			QFile dir_conf(fileSystemPath() + "/qet_directory");
+			QFile dir_conf(fileSystemPath() % "/qet_directory");
 			if (dir_conf.exists() && dir_conf.open(
 						QIODevice::ReadOnly
 						| QIODevice::Text))
diff --git a/sources/ElementsCollection/fileelementcollectionitem.cpp b/sources/ElementsCollection/fileelementcollectionitem.cpp
index 5b1031553..f00820467 100644
--- a/sources/ElementsCollection/fileelementcollectionitem.cpp
+++ b/sources/ElementsCollection/fileelementcollectionitem.cpp
@@ -67,7 +67,7 @@ QString FileElementCollectionItem::fileSystemPath() const
 	FileElementCollectionItem *feci =
 			static_cast<FileElementCollectionItem *> (parent());
 	if (feci)
-		return feci->fileSystemPath() + "/" + m_path;
+		return feci->fileSystemPath() % "/" % m_path;
 	else
 		return QString();//Null string
 }
@@ -131,7 +131,7 @@ QString FileElementCollectionItem::localName()
 		}
 		else
 		{
-			QString str(fileSystemPath() + "/qet_directory");
+			QString str(fileSystemPath() % "/qet_directory");
 			pugi::xml_document docu;
 			if(docu.load_file(str.toStdString().c_str()))
 			{
@@ -208,7 +208,7 @@ QString FileElementCollectionItem::collectionPath() const
 		if (eci->isCollectionRoot())
 			return eci->collectionPath() + m_path;
 		else
-			return eci->collectionPath() + "/" + m_path;
+			return eci->collectionPath() % "/" % m_path;
 	}
 	else
 		return QString();
diff --git a/sources/ElementsCollection/xmlelementcollection.cpp b/sources/ElementsCollection/xmlelementcollection.cpp
index a360bed0e..c142385df 100644
--- a/sources/ElementsCollection/xmlelementcollection.cpp
+++ b/sources/ElementsCollection/xmlelementcollection.cpp
@@ -446,7 +446,7 @@ QString XmlElementCollection::addElement(ElementsLocation &location)
 			if (path.isEmpty())
 				path = str;
 			else
-				path = path + "/" + str;
+				path = path % "/" % str;
 
 			QDomElement child_element = child(parent_element, str);
 
@@ -530,7 +530,7 @@ bool XmlElementCollection::addElementDefinition(
 	dom_elmt.appendChild(xml_definition.cloneNode(true));
 	dom_dir.appendChild(dom_elmt);
 
-	emit elementAdded(dir_path + "/" + name);
+	emit elementAdded(dir_path % "/" % name);
 
 	return true;
 }
@@ -617,7 +617,7 @@ bool XmlElementCollection::createDir(const QString& path,
 				     const QString& name,
 				     const NamesList &name_list)
 {
-	QString new_dir_path = path + "/" + name;
+	QString new_dir_path = path % "/" % name;
 
 	if (!directory(new_dir_path).isNull()) {
 		return true;
@@ -724,7 +724,7 @@ ElementsLocation XmlElementCollection::domToLocation(
 			dom_element = dom_element.parentNode().toElement();
 
 			if (dom_element.tagName() == "category")
-				path.prepend(dom_element.attribute("name") + "/");
+				path.prepend(dom_element.attribute("name") % "/");
 		}
 
 		return ElementsLocation(path, m_project);
@@ -789,11 +789,11 @@ ElementsLocation XmlElementCollection::copyDirectory(
 
 	//Remove the previous directory with the same path
 	QDomElement element = child(destination.collectionPath(false)
-				    + "/" + new_dir_name);
+				    % "/" % new_dir_name);
 	if (!element.isNull()) {
 		element.parentNode().removeChild(element);
 		emit directoryRemoved(destination.collectionPath(false)
-				      + "/" + new_dir_name);
+				      % "/" % new_dir_name);
 	}
 
 	ElementsLocation created_location;
@@ -813,7 +813,7 @@ ElementsLocation XmlElementCollection::copyDirectory(
 		parent_dir_dom.appendChild(elmt_dom);
 
 		created_location.setPath(destination.projectCollectionPath()
-					 + "/" + new_dir_name);
+					 % "/" % new_dir_name);
 
 		if (deep_copy)
 		{
@@ -823,7 +823,7 @@ ElementsLocation XmlElementCollection::copyDirectory(
 						QDir::Name))
 			{
 				ElementsLocation sub_source(source.fileSystemPath()
-							    + "/" + str);
+							    % "/" % str);
 				copyDirectory(sub_source, created_location);
 			}
 
@@ -834,7 +834,7 @@ ElementsLocation XmlElementCollection::copyDirectory(
 						QDir::Name))
 			{
 				ElementsLocation sub_source(source.fileSystemPath()
-							    + "/" + str);
+							    % "/" % str);
 				copyElement(sub_source, created_location);
 			}
 		}
@@ -861,7 +861,7 @@ ElementsLocation XmlElementCollection::copyDirectory(
 		other_collection_dom_dir.setAttribute("name", new_dir_name);
 		parent_dir_dom.appendChild(other_collection_dom_dir);
 
-		created_location.setPath(destination.projectCollectionPath() + "/" + new_dir_name);
+		created_location.setPath(destination.projectCollectionPath() % "/" % new_dir_name);
 	}
 
 	emit directorieAdded(created_location.collectionPath(false));
@@ -906,7 +906,7 @@ ElementsLocation XmlElementCollection::copyElement(
 
 	//Remove the previous element with the same path
 	QDomElement element = child(destination.collectionPath(false)
-				    + "/" + new_elmt_name);
+				    % "/" % new_elmt_name);
 	bool removed = false;
 	if (!element.isNull()) {
 		element.parentNode().removeChild(element);
@@ -919,7 +919,7 @@ ElementsLocation XmlElementCollection::copyElement(
 	dir_dom.appendChild(elmt_dom);
 
 	ElementsLocation copy_loc(destination.projectCollectionPath()
-				  + "/" + new_elmt_name);
+				  % "/" % new_elmt_name);
 
 	if (removed) {
 		emit elementChanged(copy_loc.collectionPath(false));
diff --git a/sources/ElementsCollection/xmlprojectelementcollectionitem.cpp b/sources/ElementsCollection/xmlprojectelementcollectionitem.cpp
index 7015b9ec3..eebc32eab 100644
--- a/sources/ElementsCollection/xmlprojectelementcollectionitem.cpp
+++ b/sources/ElementsCollection/xmlprojectelementcollectionitem.cpp
@@ -108,7 +108,7 @@ QString XmlProjectElementCollectionItem::embeddedPath() const
 		if (xpeci->isCollectionRoot())
 			return xpeci->embeddedPath() + name();
 		else
-			return xpeci->embeddedPath() + "/" + name();
+			return xpeci->embeddedPath() % "/" % name();
 	}
 	else
 		return QString();
diff --git a/sources/SearchAndReplace/ui/searchandreplacewidget.cpp b/sources/SearchAndReplace/ui/searchandreplacewidget.cpp
index 75ae79c1b..e32f10fca 100644
--- a/sources/SearchAndReplace/ui/searchandreplacewidget.cpp
+++ b/sources/SearchAndReplace/ui/searchandreplacewidget.cpp
@@ -419,7 +419,7 @@ void SearchAndReplaceWidget::search()
 			else
 			{
 					//entire word
-				QRegularExpression rx("\\b" + str + "\\b");
+				QRegularExpression rx("\\b" % str % "\\b");
 				if (!rx.isValid())
 					{
 					qWarning() <<QObject::tr("this is an error in the code")
diff --git a/sources/TerminalStrip/UndoCommand/addterminaltostripcommand.cpp b/sources/TerminalStrip/UndoCommand/addterminaltostripcommand.cpp
index 8ae0cc0e2..58fb91028 100644
--- a/sources/TerminalStrip/UndoCommand/addterminaltostripcommand.cpp
+++ b/sources/TerminalStrip/UndoCommand/addterminaltostripcommand.cpp
@@ -41,7 +41,7 @@ AddTerminalToStripCommand::AddTerminalToStripCommand(QSharedPointer<RealTerminal
 	const auto str_2 = ts_name.isEmpty() ? QObject::tr("à un groupe de bornes") :
 									 QObject::tr("au groupe de bornes %1").arg(ts_name);
 
-	setText(str_1 + " " + str_2);
+	setText(str_1 % " " % str_2);
 }
 
 AddTerminalToStripCommand::AddTerminalToStripCommand(QVector<QSharedPointer<RealTerminal>> terminals, TerminalStrip *strip, QUndoCommand *parent) :
@@ -57,7 +57,7 @@ AddTerminalToStripCommand::AddTerminalToStripCommand(QVector<QSharedPointer<Real
 	const auto str_2 = ts_name.isEmpty() ? QObject::tr("à un groupe de bornes") :
 										  QObject::tr("au groupe de bornes %1").arg(ts_name);
 
-	setText(str_1 + " " + str_2);
+	setText(str_1 % " " % str_2);
 }
 
 
@@ -143,7 +143,7 @@ void RemoveTerminalFromStripCommand::setCommandTitle()
 
 	const auto str_2 = strip_name.isEmpty() ? QObject::tr("d'un groupe de bornes") :
 											  QObject::tr("du groupe de bornes %1").arg(strip_name);
-	setText(str_1 + " " + str_2);
+	setText(str_1 % " " % str_2);
 }
 
 /**
@@ -178,7 +178,7 @@ MoveTerminalCommand::MoveTerminalCommand(QSharedPointer<PhysicalTerminal> termin
 
 	auto str_3 = new_strip_name.isEmpty() ? QObject::tr("vers un groupe de bornes") :
 											QObject::tr("vers le groupe de bornes %1").arg(new_strip_name);
-	setText(str_1 + " " + str_2 + " " + str_3);
+	setText(str_1 % " " % str_2 % " " % str_3);
 }
 
 MoveTerminalCommand::MoveTerminalCommand(QVector<QSharedPointer<PhysicalTerminal>> terminals, TerminalStrip *old_strip,
@@ -201,7 +201,7 @@ MoveTerminalCommand::MoveTerminalCommand(QVector<QSharedPointer<PhysicalTerminal
 	const auto str_3 = new_strip_name.isEmpty() ? QObject::tr("vers un groupe de bornes") :
 												  QObject::tr("vers le groupe de bornes %1").arg(new_strip_name);
 
-	setText(str_1 + " " + str_2 + " " + str_3);
+	setText(str_1 % " " % str_2 % " " % str_3);
 }
 
 void MoveTerminalCommand::undo()
diff --git a/sources/autoNum/ui/autonumberingmanagementw.cpp b/sources/autoNum/ui/autonumberingmanagementw.cpp
index f01740f92..0e28151f3 100644
--- a/sources/autoNum/ui/autonumberingmanagementw.cpp
+++ b/sources/autoNum/ui/autonumberingmanagementw.cpp
@@ -177,7 +177,7 @@ void AutoNumberingManagementW::on_m_to_folios_cb_currentIndexChanged(int index)
 		QString from = ui->m_from_folios_cb->currentText();
 		QString to = ui->m_to_folios_cb->currentText();
 		ui->m_selected_folios_le->clear();
-		ui->m_selected_folios_le->insert(from + " - " + to);
+		ui->m_selected_folios_le->insert(from % " - " % to);
 		ui->m_selected_folios_le->setDisabled(true);
 	}
 	applyEnable(true);
diff --git a/sources/borderproperties.cpp b/sources/borderproperties.cpp
index c1ced7e9f..77162b730 100644
--- a/sources/borderproperties.cpp
+++ b/sources/borderproperties.cpp
@@ -138,12 +138,12 @@ void BorderProperties::fromXml(QDomElement &e) {
 */
 void BorderProperties::toSettings(QSettings &settings, const QString &prefix) const
 {
-	settings.setValue(prefix + "cols",        columns_count);
-	settings.setValue(prefix + "colsize",     columns_width);
-	settings.setValue(prefix + "displaycols", display_columns);
-	settings.setValue(prefix + "rows",        rows_count);
-	settings.setValue(prefix + "rowsize",     rows_height);
-	settings.setValue(prefix + "displayrows", display_rows);
+	settings.setValue(prefix % "cols",        columns_count);
+	settings.setValue(prefix % "colsize",     columns_width);
+	settings.setValue(prefix % "displaycols", display_columns);
+	settings.setValue(prefix % "rows",        rows_count);
+	settings.setValue(prefix % "rowsize",     rows_height);
+	settings.setValue(prefix % "displayrows", display_rows);
 }
 
 /**
@@ -156,13 +156,13 @@ void BorderProperties::toSettings(QSettings &settings, const QString &prefix) co
 	\~French prefixe a ajouter devant les noms des parametres
 */
 void BorderProperties::fromSettings(QSettings &settings, const QString &prefix) {
-	columns_count   = settings.value(prefix + "cols",            columns_count).toInt();
-	columns_width   = qRound(settings.value(prefix + "colsize",  columns_width).toDouble());
-	display_columns = settings.value(prefix + "displaycols",     display_columns).toBool();
+	columns_count   = settings.value(prefix % "cols",            columns_count).toInt();
+	columns_width   = qRound(settings.value(prefix % "colsize",  columns_width).toDouble());
+	display_columns = settings.value(prefix % "displaycols",     display_columns).toBool();
 	
-	rows_count      = settings.value(prefix + "rows",            rows_count).toInt();
-	rows_height     = qRound(settings.value(prefix + "rowsize",  rows_height).toDouble());
-	display_rows    = settings.value(prefix + "displayrows",     display_rows).toBool();
+	rows_count      = settings.value(prefix % "rows",            rows_count).toInt();
+	rows_height     = qRound(settings.value(prefix % "rowsize",  rows_height).toDouble());
+	display_rows    = settings.value(prefix % "displayrows",     display_rows).toBool();
 }
 
 /**
diff --git a/sources/bordertitleblock.cpp b/sources/bordertitleblock.cpp
index 7c744c810..8d86e7a7d 100644
--- a/sources/bordertitleblock.cpp
+++ b/sources/bordertitleblock.cpp
@@ -949,7 +949,7 @@ QString BorderTitleBlock::incrementLetters(const QString &string) {
 			last_digit = (char)(string[string.length()-1].unicode()) + 1;
 			return(first_digits + QString(last_digit));
 		} else {
-			return(incrementLetters(first_digits) + "A");
+			return(incrementLetters(first_digits) % "A");
 		}
 	}
 }
diff --git a/sources/conductornumexport.cpp b/sources/conductornumexport.cpp
index a18bf527b..a67fda30b 100644
--- a/sources/conductornumexport.cpp
+++ b/sources/conductornumexport.cpp
@@ -49,7 +49,7 @@ bool ConductorNumExport::toCsv()
 		//save in csv file in same directory as project by default
 	QString dir = m_project->currentDir();
 	if (dir.isEmpty()) dir = QETApp::documentDir();
-	QString name = dir + "/" + QObject::tr("numero_de_fileries_") + m_project->title() + ".csv";
+	QString name = dir % "/" % QObject::tr("numero_de_fileries_") % m_project->title() % ".csv";
 	//    if(!name.endsWith(".csv")) {
 	//        name += ".csv";
 	//    }
@@ -105,7 +105,7 @@ QString ConductorNumExport::wiresNum() const
 	for (QString key : list)
 	{
 		for (int i=0; i<m_hash.value(key) ; ++i) {
-			csv.append(key + "\n");
+			csv.append(key % "\n");
 		}
 	}
 
diff --git a/sources/dataBase/projectdatabase.cpp b/sources/dataBase/projectdatabase.cpp
index 6ed800ad2..98b3fddd2 100644
--- a/sources/dataBase/projectdatabase.cpp
+++ b/sources/dataBase/projectdatabase.cpp
@@ -549,7 +549,7 @@ void projectDataBase::prepareQuery()
 		//UPDATE DIAGRAM INFO
 	QString update_diagram_str("UPDATE diagram_info SET ");
 	for (auto str : QETInformation::diagramInfoKeys()) {
-		update_diagram_str.append(str + " = :" + str + ", ");
+		update_diagram_str.append(str % " = :" % str % ", ");
 	}
 	update_diagram_str.remove(update_diagram_str.length()-2, 2); //Remove the last ", "
 	update_diagram_str.append(" WHERE diagram_uuid = :uuid");
@@ -589,7 +589,7 @@ void projectDataBase::prepareQuery()
 		//UPDATE ELEMENT INFO
 	QString update_str("UPDATE element_info SET ");
 	for (auto string : QETInformation::elementInfoKeys()) {
-		update_str.append(string + " = :" + string + ", ");
+		update_str.append(string % " = :" % string % ", ");
 	}
 	update_str.remove(update_str.length()-2, 2); //Remove the last ", "
 	update_str.append(" WHERE element_uuid = :uuid");
@@ -678,7 +678,7 @@ void projectDataBase::exportDb(projectDataBase *db,
 	if(dir_.isEmpty()) {
 		dir_ = db->project()->filePath();
 		if (dir_.isEmpty()) {
-			dir_ = QETApp::documentDir() + "/" + tr("sans_nom") + ".sqlite";
+			dir_ = QETApp::documentDir() % "/" % tr("sans_nom") % ".sqlite";
 		} else {
 			dir_.remove(".qet");
 			dir_.append(".sqlite");
@@ -690,7 +690,7 @@ void projectDataBase::exportDb(projectDataBase *db,
 		return;
 	}
 
-	QString connection_name("export_project_db_" + db->project()->uuid().toString());
+	QString connection_name("export_project_db_" % db->project()->uuid().toString());
 
 	if (true) //Enter in a scope only to nicely use QSqlDatabase::removeDatabase just after the end of the scope
 	{
diff --git a/sources/dataBase/ui/elementquerywidget.cpp b/sources/dataBase/ui/elementquerywidget.cpp
index 84956fb28..6b78fbfe7 100644
--- a/sources/dataBase/ui/elementquerywidget.cpp
+++ b/sources/dataBase/ui/elementquerywidget.cpp
@@ -416,7 +416,7 @@ void ElementQueryWidget::setGroupBy(QString text, bool set)
 void ElementQueryWidget::setCount(QString text, bool set)
 {
 	if (set) {
-		m_count = QString(", " + text + " ");
+		m_count = QString(", " % text % " ");
 	} else {
 		m_count.clear();
 	}
@@ -489,7 +489,7 @@ QPair<int, QString> ElementQueryWidget::FilterFor(const QString &key) const
 */
 void ElementQueryWidget::fillSavedQuery()
 {
-	QFile file(QETApp::configDir() + "/nomenclature.json");
+	QFile file(QETApp::configDir() % "/nomenclature.json");
 	if (file.open(QFile::ReadOnly))
 	{
 		QJsonDocument jsd(QJsonDocument::fromJson(file.readAll()));
@@ -625,7 +625,7 @@ void ElementQueryWidget::on_m_load_pb_clicked()
 		return;
 	}
 
-	QFile file_(QETApp::configDir() + "/nomenclature.json");
+	QFile file_(QETApp::configDir() % "/nomenclature.json");
 	if (!file_.open(QFile::ReadOnly)) {
 		return;
 	}
@@ -650,7 +650,7 @@ void ElementQueryWidget::on_m_load_pb_clicked()
 */
 void ElementQueryWidget::on_m_save_current_conf_pb_clicked()
 {
-	QFile file_(QETApp::configDir() + "/nomenclature.json");
+	QFile file_(QETApp::configDir() % "/nomenclature.json");
 
 	if (file_.open(QFile::ReadWrite))
 	{
diff --git a/sources/dataBase/ui/summaryquerywidget.cpp b/sources/dataBase/ui/summaryquerywidget.cpp
index efc2c1d5a..1ca3d52ed 100644
--- a/sources/dataBase/ui/summaryquerywidget.cpp
+++ b/sources/dataBase/ui/summaryquerywidget.cpp
@@ -143,7 +143,7 @@ void SummaryQueryWidget::setUpItems()
 */
 void SummaryQueryWidget::fillSavedQuery()
 {
-	QFile file(QETApp::configDir() + "/summary.json");
+	QFile file(QETApp::configDir() % "/summary.json");
 	if (file.open(QFile::ReadOnly))
 	{
 		QJsonDocument jsd(QJsonDocument::fromJson(file.readAll()));
@@ -296,7 +296,7 @@ void SummaryQueryWidget::reset()
 */
 void SummaryQueryWidget::saveConfig()
 {
-	QFile file_(QETApp::configDir() + "/summary.json");
+	QFile file_(QETApp::configDir() % "/summary.json");
 
 	if (file_.open(QFile::ReadWrite))
 	{
@@ -331,7 +331,7 @@ void SummaryQueryWidget::loadConfig()
 		return;
 	}
 
-	QFile file_(QETApp::configDir() + "/summary.json");
+	QFile file_(QETApp::configDir() % "/summary.json");
 	if (!file_.open(QFile::ReadOnly)) {
 		return;
 	}
diff --git a/sources/dxf/dxftoelmt.cpp b/sources/dxf/dxftoelmt.cpp
index bd21f2c54..916e228d0 100644
--- a/sources/dxf/dxftoelmt.cpp
+++ b/sources/dxf/dxftoelmt.cpp
@@ -71,7 +71,7 @@ QByteArray dxfToElmt(const QString &file_path)
 
 QString dxf2ElmtDirPath()
 {
-	return QETApp::dataDir() + "/binary";
+	return QETApp::dataDir() % "/binary";
 }
 
 /**
@@ -81,11 +81,11 @@ QString dxf2ElmtDirPath()
 QString dxf2ElmtBinaryPath()
 {
 #if defined(Q_OS_WIN32) || defined(Q_OS_WIN64)
-	return dxf2ElmtDirPath() + QStringLiteral("/dxf2elmt.exe");
+	return dxf2ElmtDirPath() % QStringLiteral("/dxf2elmt.exe");
 #elif defined(Q_OS_MACOS)
-	return dxf2ElmtDirPath() + QStringLiteral("/./dxf2elmt");
+	return dxf2ElmtDirPath() % QStringLiteral("/./dxf2elmt");
 #else
-	return dxf2ElmtDirPath() + QStringLiteral("/dxf2elmt");
+	return dxf2ElmtDirPath() % QStringLiteral("/dxf2elmt");
 #endif
 }
 
diff --git a/sources/elementtextpattern.cpp b/sources/elementtextpattern.cpp
index f76fae68b..71a2f9586 100644
--- a/sources/elementtextpattern.cpp
+++ b/sources/elementtextpattern.cpp
@@ -59,7 +59,7 @@ ExportElementTextPattern::ExportElementTextPattern(Element *elmt) :
 		return;
 	
 		//Check if a conf with the same name already exist
-	if (QFileInfo::exists(dir.absoluteFilePath(m_name + ".xml")))
+	if (QFileInfo::exists(dir.absoluteFilePath(m_name % ".xml")))
 	{
 		bool r = QMessageBox::question(parentWidget(),
 									   QObject::tr("Configuration de textes"),
@@ -71,7 +71,7 @@ ExportElementTextPattern::ExportElementTextPattern(Element *elmt) :
 	}
 	
 	QDomDocument doc = xmlConf();
-	QET::writeXmlFile(doc, dir.absoluteFilePath(m_name + ".xml"));
+	QET::writeXmlFile(doc, dir.absoluteFilePath(m_name % ".xml"));
 }
 
 /**
@@ -202,7 +202,7 @@ void ImportElementTextPattern::apply(QString name, bool erase) const
 	if(!name.endsWith(".xml"))
 		name.append(".xml");
 	
-	QFile conf_file(QETApp::configDir() + "/element_texts_pattern/" + name);
+	QFile conf_file(QETApp::configDir() % "/element_texts_pattern/" % name);
 	if(!conf_file.open(QIODevice::ReadOnly | QIODevice::Text))
 		return;
 	
diff --git a/sources/exportdialog.cpp b/sources/exportdialog.cpp
index 2e593ed75..29d14f958 100644
--- a/sources/exportdialog.cpp
+++ b/sources/exportdialog.cpp
@@ -1014,7 +1014,7 @@ ExportDialog::ExportDiagramLine::ExportDiagramLine(Diagram *dia, QSize diagram_s
 	if (diagram_title.isEmpty()) diagram_title = QObject::tr("Folio sans titre");
 	QString diagram_filename = diagram -> title();
 	if (diagram_filename.isEmpty()) diagram_filename = QObject::tr("schema");
-	diagram_filename = QET::stringToFileName(diagram_index + "_" + diagram_filename);
+	diagram_filename = QET::stringToFileName(diagram_index % "_" % diagram_filename);
 	
 	title_label = new QLabel(diagram_title);
 	
diff --git a/sources/exportproperties.cpp b/sources/exportproperties.cpp
index 250632624..191ac0c12 100644
--- a/sources/exportproperties.cpp
+++ b/sources/exportproperties.cpp
@@ -54,24 +54,24 @@ ExportProperties::~ExportProperties()
 void ExportProperties::toSettings(QSettings &settings,
 				  const QString &prefix) const
 {
-	settings.setValue(prefix + "path",
+	settings.setValue(prefix % "path",
 			  QDir::toNativeSeparators(
 				  destination_directory.absolutePath()));
-	settings.setValue(prefix + "format",
+	settings.setValue(prefix % "format",
 			  format);
-	settings.setValue(prefix + "drawgrid",
+	settings.setValue(prefix % "drawgrid",
 			  draw_grid);
-	settings.setValue(prefix + "drawborder",
+	settings.setValue(prefix % "drawborder",
 			  draw_border);
-	settings.setValue(prefix + "drawtitleblock",
+	settings.setValue(prefix % "drawtitleblock",
 			  draw_titleblock);
-	settings.setValue(prefix + "drawterminals",
+	settings.setValue(prefix % "drawterminals",
 			  draw_terminals);
-	settings.setValue(prefix + "drawbgtransparent",
+	settings.setValue(prefix % "drawbgtransparent",
 			  draw_bg_transparent);
-	settings.setValue(prefix + "drawcoloredconductors",
+	settings.setValue(prefix % "drawcoloredconductors",
 			  draw_colored_conductors);
-	settings.setValue(prefix + "area",
+	settings.setValue(prefix % "area",
 			  QET::diagramAreaToString(exported_area));
 }
 
@@ -85,30 +85,30 @@ void ExportProperties::fromSettings(QSettings &settings,
 	QString export_path = QETApp::documentDir();
 	destination_directory.setPath(
 				settings.value(
-					prefix + "path",
+					prefix % "path",
 					export_path).toString());
 	if (!destination_directory.exists())
 		destination_directory.setPath(export_path);
 
-	format = settings.value(prefix + "format").toString();
+	format = settings.value(prefix % "format").toString();
 
-	draw_grid = settings.value(prefix + "drawgrid",
+	draw_grid = settings.value(prefix % "drawgrid",
 				   false).toBool();
-	draw_border = settings.value(prefix + "drawborder",
+	draw_border = settings.value(prefix % "drawborder",
 				     true ).toBool();
-	draw_titleblock = settings.value(prefix + "drawtitleblock",
+	draw_titleblock = settings.value(prefix % "drawtitleblock",
 					 true ).toBool();
-	draw_terminals = settings.value(prefix + "drawterminals",
+	draw_terminals = settings.value(prefix % "drawterminals",
 					false).toBool();
-	draw_bg_transparent = settings.value(prefix + "drawbgtransparent",
+	draw_bg_transparent = settings.value(prefix % "drawbgtransparent",
 					false).toBool();
 	draw_colored_conductors = settings.value(
-				prefix + "drawcoloredconductors",
+				prefix % "drawcoloredconductors",
 				true ).toBool();
 
 	exported_area  = QET::diagramAreaFromString(
 				settings.value(
-					prefix + "area",
+					prefix % "area",
 					"border").toString());
 }
 
diff --git a/sources/factory/ui/addtabledialog.cpp b/sources/factory/ui/addtabledialog.cpp
index 374199165..9b87ac6e5 100644
--- a/sources/factory/ui/addtabledialog.cpp
+++ b/sources/factory/ui/addtabledialog.cpp
@@ -202,7 +202,7 @@ void AddTableDialog::on_m_table_margins_pb_clicked()
 
 void AddTableDialog::saveConfig()
 {
-	QFile file_(QETApp::configDir() + "/graphics_table.json");
+	QFile file_(QETApp::configDir() % "/graphics_table.json");
 	
 	if (file_.open(QFile::ReadWrite))
 	{
@@ -247,7 +247,7 @@ void AddTableDialog::loadConfig()
 		return;
 	}
 
-	QFile file_(QETApp::configDir() + "/graphics_table.json");
+	QFile file_(QETApp::configDir() % "/graphics_table.json");
 	if (!file_.open(QFile::ReadOnly)) {
 		return;
 	}
@@ -297,7 +297,7 @@ void AddTableDialog::loadConfig()
 
 void AddTableDialog::fillSavedQuery()
 {
-	QFile file(QETApp::configDir() + "/graphics_table.json");
+	QFile file(QETApp::configDir() % "/graphics_table.json");
 	if (file.open(QFile::ReadOnly))
 	{
 		QJsonDocument jsd(QJsonDocument::fromJson(file.readAll()));
diff --git a/sources/main.cpp b/sources/main.cpp
index cf965fd4c..8e3a05d36 100644
--- a/sources/main.cpp
+++ b/sources/main.cpp
@@ -132,7 +132,7 @@ void myMessageOutput(QtMsgType type,
 void delete_old_log_files(int days)
 {
 	const QDate today = QDate::currentDate();
-	const QString path = QETApp::dataDir() + "/";
+	const QString path = QETApp::dataDir() % "/";
 
 	QString filter("%1%1%1%1%1%1%1%1.log"); // pattern
 	filter = filter.arg("[0123456789]"); // valid characters
@@ -148,7 +148,7 @@ void delete_old_log_files(int days)
 			QDir deletefile;
 			deletefile.setPath(filepath);
 			deletefile.remove(filepath);
-			qDebug() << "File " + filepath + " is deleted!";
+			qDebug() << "File " % filepath % " is deleted!";
 		}
 	}
 }
diff --git a/sources/properties/xrefproperties.cpp b/sources/properties/xrefproperties.cpp
index 2ce72747e..848a04144 100644
--- a/sources/properties/xrefproperties.cpp
+++ b/sources/properties/xrefproperties.cpp
@@ -47,24 +47,24 @@ XRefProperties::XRefProperties()
 void XRefProperties::toSettings(QSettings &settings,
 				const QString prefix) const
 {
-	settings.setValue(prefix + "showpowerctc", m_show_power_ctc);
+	settings.setValue(prefix % "showpowerctc", m_show_power_ctc);
 	QString display = m_display == Cross? "cross" : "contacts";
-	settings.setValue(prefix + "displayhas", display);
+	settings.setValue(prefix % "displayhas", display);
 	QString snap = m_snap_to == Bottom? "bottom" : "label";
-	settings.setValue(prefix + "snapto", snap);
+	settings.setValue(prefix % "snapto", snap);
 	int offset = m_offset;
-	settings.setValue(prefix + "offset", offset);
+	settings.setValue(prefix % "offset", offset);
 	QString master_label = m_master_label;
-	settings.setValue(prefix + "master_label", master_label);
+	settings.setValue(prefix % "master_label", master_label);
 	QString slave_label = m_slave_label;
-	settings.setValue(prefix + "slave_label", slave_label);
+	settings.setValue(prefix % "slave_label", slave_label);
 
 
 	QMetaEnum var = QMetaEnum::fromType<Qt::Alignment>();
-	settings.setValue(prefix + "xrefpos",  var.valueToKey(m_xref_pos));
+	settings.setValue(prefix % "xrefpos",  var.valueToKey(m_xref_pos));
 
 	foreach (QString key, m_prefix.keys()) {
-		settings.setValue(prefix + key + "prefix", m_prefix.value(key));
+		settings.setValue(prefix % key % "prefix", m_prefix.value(key));
 	}
 }
 
@@ -77,20 +77,20 @@ void XRefProperties::toSettings(QSettings &settings,
 void XRefProperties::fromSettings(const QSettings &settings,
 				  const QString prefix)
 {
-	m_show_power_ctc = settings.value(prefix + "showpowerctc", true).toBool();
-	QString display = settings.value(prefix + "displayhas", "cross").toString();
+	m_show_power_ctc = settings.value(prefix % "showpowerctc", true).toBool();
+	QString display = settings.value(prefix % "displayhas", "cross").toString();
 	display == "cross"? m_display = Cross : m_display = Contacts;
-	QString snap = settings.value(prefix + "snapto", "label").toString();
+	QString snap = settings.value(prefix % "snapto", "label").toString();
 	snap == "bottom"? m_snap_to = Bottom : m_snap_to = Label;
-	m_offset = settings.value(prefix + "offset", "0").toInt();
-	m_master_label = settings.value(prefix + "master_label", "%f-%l%c").toString();
-	m_slave_label = settings.value(prefix + "slave_label", "(%f-%l%c)").toString();
+	m_offset = settings.value(prefix % "offset", "0").toInt();
+	m_master_label = settings.value(prefix % "master_label", "%f-%l%c").toString();
+	m_slave_label = settings.value(prefix % "slave_label", "(%f-%l%c)").toString();
 
 	QMetaEnum var = QMetaEnum::fromType<Qt::Alignment>();
-	m_xref_pos = Qt::AlignmentFlag(var.keyToValue((settings.value(prefix + "xrefpos").toString()).toStdString().data()));
+	m_xref_pos = Qt::AlignmentFlag(var.keyToValue((settings.value(prefix % "xrefpos").toString()).toStdString().data()));
 
 	for (QString key : m_prefix_keys) {
-		m_prefix.insert(key, settings.value(prefix + key + "prefix").toString());
+		m_prefix.insert(key, settings.value(prefix + key % "prefix").toString());
 	}
 }
 
@@ -124,7 +124,7 @@ QDomElement XRefProperties::toXml(QDomDocument &xml_document) const
 	QString slave_label = m_slave_label;
 	xml_element.setAttribute("slave_label", slave_label);
 	foreach (QString key, m_prefix.keys()) {
-		xml_element.setAttribute(key + "prefix", m_prefix.value(key));
+		xml_element.setAttribute(key % "prefix", m_prefix.value(key));
 	}
 
 	return xml_element;
@@ -155,7 +155,7 @@ bool XRefProperties::fromXml(const QDomElement &xml_element) {
 	m_master_label = xml_element.attribute("master_label", "%f-%l%c");
 	m_slave_label = xml_element.attribute("slave_label","(%f-%l%c)");
 	foreach (QString key, m_prefix_keys) {
-		m_prefix.insert(key, xml_element.attribute(key + "prefix"));
+		m_prefix.insert(key, xml_element.attribute(key % "prefix"));
 	}
 	return true;
 }
diff --git a/sources/qet_elementscaler/qet_elementscaler.cpp b/sources/qet_elementscaler/qet_elementscaler.cpp
index b4ad83150..6d486dacf 100644
--- a/sources/qet_elementscaler/qet_elementscaler.cpp
+++ b/sources/qet_elementscaler/qet_elementscaler.cpp
@@ -113,7 +113,7 @@ QByteArray ElementScaler(const QString &file_path, QWidget *parent)
 
 QString ElementScalerDirPath()
 {
-	return QETApp::dataDir() + "/binary";
+	return QETApp::dataDir() % "/binary";
 }
 
 /**
@@ -123,11 +123,11 @@ QString ElementScalerDirPath()
 QString ElementScalerBinaryPath()
 {
 #if defined(Q_OS_WIN32) || defined(Q_OS_WIN64)
-	return ElementScalerDirPath() + QStringLiteral("/QET_ElementScaler.exe");
+	return ElementScalerDirPath() % QStringLiteral("/QET_ElementScaler.exe");
 #elif defined(Q_OS_MACOS)
-	return ElementScalerDirPath() + QStringLiteral("/./QET_ElementScaler");
+	return ElementScalerDirPath() % QStringLiteral("/./QET_ElementScaler");
 #else
-	return ElementScalerDirPath() + QStringLiteral("/QET_ElementScaler");
+	return ElementScalerDirPath() % QStringLiteral("/QET_ElementScaler");
 #endif
 }
 
diff --git a/sources/qetproject.cpp b/sources/qetproject.cpp
index 495a14e2e..3ecb8bdf6 100644
--- a/sources/qetproject.cpp
+++ b/sources/qetproject.cpp
@@ -1141,7 +1141,7 @@ ElementsLocation QETProject::importElement(ElementsLocation &location)
 				do
 				{
 					a++;
-					QString new_path = parent_path + "/" + name_ + QString::number(a) + ".elmt";
+					QString new_path = parent_path % "/" % name_ % QString::number(a) % ".elmt";
 					loc = ElementsLocation (new_path);
 				} while (loc.exist());
 
diff --git a/sources/recentfiles.cpp b/sources/recentfiles.cpp
index 7819f4f51..5c1b789e0 100644
--- a/sources/recentfiles.cpp
+++ b/sources/recentfiles.cpp
@@ -132,7 +132,7 @@ void RecentFiles::extractFilesFromSettings()
 	QSettings settings;
 	for (int i = size_ ; i >= 1  ; -- i)
 	{
-		QString key(identifier_ + "-recentfiles/file" + QString::number(i));
+		QString key(identifier_ % "-recentfiles/file" % QString::number(i));
 		QString value(settings.value(key, QString()).toString());
 		insertFile(value);
 	}
@@ -165,7 +165,7 @@ void RecentFiles::saveFilesToSettings()
 	QSettings settings;
 	for (int i = 0 ; i < size_ && i < list_.count() ; ++ i)
 	{
-		QString key(identifier_ + "-recentfiles/file" + QString::number(i + 1));
+		QString key(identifier_ % "-recentfiles/file" % QString::number(i + 1));
 		settings.setValue(key, list_[i]);
 	}
 }
diff --git a/sources/titleblock/templatelogomanager.cpp b/sources/titleblock/templatelogomanager.cpp
index 54493e481..56c11501f 100644
--- a/sources/titleblock/templatelogomanager.cpp
+++ b/sources/titleblock/templatelogomanager.cpp
@@ -312,7 +312,7 @@ void TitleBlockTemplateLogoManager::exportLogo()
 	QString filepath = QFileDialog::getSaveFileName(
 		this,
 		tr("Choisir un fichier pour exporter ce logo"),
-		open_dialog_dir_.absolutePath() + "/" + current_logo,
+		open_dialog_dir_.absolutePath() % "/" % current_logo,
 		tr("Tous les fichiers (*);;Images vectorielles (*.svg);;Images bitmap (*.png *.jpg *.jpeg *.gif *.bmp *.xpm)")
 	);
 	if (filepath.isEmpty()) return;
diff --git a/sources/titleblockproperties.cpp b/sources/titleblockproperties.cpp
index c053b43c0..28e924a43 100644
--- a/sources/titleblockproperties.cpp
+++ b/sources/titleblockproperties.cpp
@@ -140,20 +140,20 @@ void TitleBlockProperties::fromXml(const QDomElement &e) {
 */
 void TitleBlockProperties::toSettings(QSettings &settings, const QString &prefix) const
 {
-	settings.setValue(prefix + "title",    title);
-	settings.setValue(prefix + "author",   author);
-	settings.setValue(prefix + "filename", filename);
-	settings.setValue(prefix + "plant", plant);
-	settings.setValue(prefix + "locmach", locmach);
-	settings.setValue(prefix + "indexrev", indexrev);
-	settings.setValue(prefix + "version", version);
-	settings.setValue(prefix + "folio",    folio);
-	settings.setValue(prefix + "auto_page_num",    auto_page_num);
-	settings.setValue(prefix + "date",     exportDate());
-	settings.setValue(prefix + "displayAt", (display_at == Qt::BottomEdge? "bottom" : "right"));
-	settings.setValue(prefix + "titleblocktemplate", template_name.isEmpty()? QString() : template_name);
-	settings.setValue(prefix + "titleblocktemplateCollection", QET::qetCollectionToString(collection));
-	context.toSettings(settings, prefix + "properties");
+	settings.setValue(prefix % "title",    title);
+	settings.setValue(prefix % "author",   author);
+	settings.setValue(prefix % "filename", filename);
+	settings.setValue(prefix % "plant", plant);
+	settings.setValue(prefix % "locmach", locmach);
+	settings.setValue(prefix % "indexrev", indexrev);
+	settings.setValue(prefix % "version", version);
+	settings.setValue(prefix % "folio",    folio);
+	settings.setValue(prefix % "auto_page_num",    auto_page_num);
+	settings.setValue(prefix % "date",     exportDate());
+	settings.setValue(prefix % "displayAt", (display_at == Qt::BottomEdge? "bottom" : "right"));
+	settings.setValue(prefix % "titleblocktemplate", template_name.isEmpty()? QString() : template_name);
+	settings.setValue(prefix % "titleblocktemplateCollection", QET::qetCollectionToString(collection));
+	context.toSettings(settings, prefix % "properties");
 }
 
 /**
@@ -162,20 +162,20 @@ void TitleBlockProperties::toSettings(QSettings &settings, const QString &prefix
 	@param prefix prefixe a ajouter devant les noms des parametres
 */
 void TitleBlockProperties::fromSettings(QSettings &settings, const QString &prefix) {
-	title    = settings.value(prefix + "title").toString();
-	author   = settings.value(prefix + "author").toString();
-	filename = settings.value(prefix + "filename").toString();
-	plant    = settings.value(prefix + "plant").toString();
-	locmach  = settings.value(prefix + "locmach").toString();
-	indexrev = settings.value(prefix + "indexrev").toString();
-	version  = settings.value(prefix + "version").toString();
-	folio    = settings.value(prefix + "folio", "%id/%total").toString();
-	auto_page_num = settings.value(prefix + "auto_page_num").toString();
-	setDateFromString(settings.value(prefix + "date").toString());
-	display_at = (settings.value(prefix + "displayAt", QVariant("bottom")).toString() == "bottom" ? Qt::BottomEdge : Qt::RightEdge);
-	template_name = settings.value(prefix + "titleblocktemplate").toString();
-	collection = QET::qetCollectionFromString(settings.value(prefix + "titleblocktemplateCollection").toString());
-	context.fromSettings(settings, prefix + "properties");
+	title    = settings.value(prefix % "title").toString();
+	author   = settings.value(prefix % "author").toString();
+	filename = settings.value(prefix % "filename").toString();
+	plant    = settings.value(prefix % "plant").toString();
+	locmach  = settings.value(prefix % "locmach").toString();
+	indexrev = settings.value(prefix % "indexrev").toString();
+	version  = settings.value(prefix % "version").toString();
+	folio    = settings.value(prefix % "folio", "%id/%total").toString();
+	auto_page_num = settings.value(prefix % "auto_page_num").toString();
+	setDateFromString(settings.value(prefix % "date").toString());
+	display_at = (settings.value(prefix % "displayAt", QVariant("bottom")).toString() == "bottom" ? Qt::BottomEdge : Qt::RightEdge);
+	template_name = settings.value(prefix % "titleblocktemplate").toString();
+	collection = QET::qetCollectionFromString(settings.value(prefix % "titleblocktemplateCollection").toString());
+	context.fromSettings(settings, prefix % "properties");
 }
 
 /**
diff --git a/sources/titleblocktemplate.cpp b/sources/titleblocktemplate.cpp
index b889e1e49..2fccc5481 100644
--- a/sources/titleblocktemplate.cpp
+++ b/sources/titleblocktemplate.cpp
@@ -1740,9 +1740,9 @@ QString TitleBlockTemplate::interpreteVariables(
 	QString interpreted_string = string;
 	foreach (QString key,
 		 diagram_context.keys(DiagramContext::DecreasingLength)) {
-		interpreted_string.replace("%{" + key + "}",
+		interpreted_string.replace("%{" % key % "}",
 					   diagram_context[key].toString());
-		interpreted_string.replace("%" + key,
+		interpreted_string.replace("%" % key,
 					   diagram_context[key].toString());
 	}
 	return(interpreted_string);
diff --git a/sources/ui/bomexportdialog.cpp b/sources/ui/bomexportdialog.cpp
index 0f7b4b74d..9935aed3d 100644
--- a/sources/ui/bomexportdialog.cpp
+++ b/sources/ui/bomexportdialog.cpp
@@ -65,7 +65,7 @@ int BOMExportDialog::exec()
 			//save in csv file in same directory as project by default
 		QString dir = m_project->currentDir();
 		if (dir.isEmpty()) dir = QETApp::documentDir();
-		QString file_name = dir + "/" + tr("nomenclature_") + QString(m_project ->title() + ".csv");
+		QString file_name = dir % "/" % tr("nomenclature_") % QString(m_project ->title() % ".csv");
 		QString file_path = QFileDialog::getSaveFileName(this, tr("Enregister sous... "), file_name, tr("Fichiers csv (*.csv)"));
 		QFile file(file_path);
 		if (!file_path.isEmpty())
@@ -132,7 +132,7 @@ QString BOMExportDialog::getBom()
 				}
 
 			}
-			return_string = header_name.join(";") + "\n";
+			return_string = header_name.join(";") % "\n";
 		}
 
 			//ROWS
@@ -151,7 +151,7 @@ QString BOMExportDialog::getBom()
 				++i;
 			}
 
-			return_string += values.join(";") + "\n";
+			return_string += values.join(";") % "\n";
 			values.clear();
 		}
 	}
diff --git a/sources/ui/configpage/configpages.cpp b/sources/ui/configpage/configpages.cpp
index 62f711209..09b48035f 100644
--- a/sources/ui/configpage/configpages.cpp
+++ b/sources/ui/configpage/configpages.cpp
@@ -339,9 +339,9 @@ void PrintConfigPage::applyConf()
 	epw -> exportProperties().toSettings(settings, prefix);
 
 	// annule l'enregistrement de certaines proprietes non pertinentes
-	settings.remove(prefix + "path");
-	settings.remove(prefix + "format");
-	settings.remove(prefix + "area");
+	settings.remove(prefix % "path");
+	settings.remove(prefix % "format");
+	settings.remove(prefix % "area");
 }
 
 /// @return l'icone de cette page