diff --git a/src/plugins/autotest/boost/boosttestoutputreader.cpp b/src/plugins/autotest/boost/boosttestoutputreader.cpp
index ecc93648da9..7338c6a6609 100644
--- a/src/plugins/autotest/boost/boosttestoutputreader.cpp
+++ b/src/plugins/autotest/boost/boosttestoutputreader.cpp
@@ -421,17 +421,17 @@ void BoostTestOutputReader::onFinished(int exitCode, QProcess::ExitStatus /*exit
     if (m_logLevel == LogLevel::Nothing && m_reportLevel == ReportLevel::No) {
         switch (exitCode) {
         case 0:
-            reportNoOutputFinish(tr("Running tests exited with ") + "boost::exit_success.",
+            reportNoOutputFinish(tr("Running tests exited with %1").arg("boost::exit_success."),
                                  ResultType::Pass);
             break;
         case 200:
             reportNoOutputFinish(
-                        tr("Running tests exited with ") + "boost::exit_test_exception.",
+                        tr("Running tests exited with %1").arg("boost::exit_test_exception."),
                         ResultType::MessageFatal);
             break;
         case 201:
-            reportNoOutputFinish(tr("Running tests exited with ")
-                                 + "boost::exit_test_failure.", ResultType::Fail);
+            reportNoOutputFinish(tr("Running tests exited with %1")
+                                 .arg("boost::exit_test_failure."), ResultType::Fail);
             break;
         }
     } else if (exitCode != 0 && exitCode != 201 && !m_description.isEmpty()) {
diff --git a/src/plugins/clangtools/clangtool.cpp b/src/plugins/clangtools/clangtool.cpp
index 27b2fe2c219..5866103df4b 100644
--- a/src/plugins/clangtools/clangtool.cpp
+++ b/src/plugins/clangtools/clangtool.cpp
@@ -1155,7 +1155,7 @@ void ClangTool::updateForCurrentState()
     const bool hasErrorText = !m_infoBarWidget->errorText().isEmpty();
     const bool hasErrors = m_filesFailed > 0;
     if (hasErrors && !hasErrorText) {
-        const QString text = makeLink( tr("Failed to analyze %1 files.").arg(m_filesFailed));
+        const QString text = makeLink(tr("Failed to analyze %n file(s).", nullptr, m_filesFailed));
         m_infoBarWidget->setError(InfoBarWidget::Warning, text, [this]() { showOutputPane(); });
     }
 
@@ -1171,9 +1171,8 @@ void ClangTool::updateForCurrentState()
         if (m_filesCount == 0) {
             infoText = tr("Analyzing..."); // Not yet fully started/initialized
         } else {
-            infoText = tr("Analyzing... %1 of %2 files processed.")
-                           .arg(m_filesSucceeded + m_filesFailed)
-                           .arg(m_filesCount);
+            infoText = tr("Analyzing... %1 of %n file(s) processed.", nullptr, m_filesCount)
+                           .arg(m_filesSucceeded + m_filesFailed);
         }
         break;
     case State::PreparationStarted:
@@ -1186,7 +1185,7 @@ void ClangTool::updateForCurrentState()
         infoText = tr("Analysis stopped by user.");
         break;
     case State::AnalyzerFinished:
-        infoText = tr("Finished processing %1 files.").arg(m_filesCount);
+        infoText = tr("Finished processing %n file(s).", nullptr, m_filesCount);
         break;
     case State::ImportFinished:
         infoText = tr("Diagnostics imported.");
diff --git a/src/plugins/clangtools/clangtoolruncontrol.cpp b/src/plugins/clangtools/clangtoolruncontrol.cpp
index bd4ee19758c..4a8cbcfbf4b 100644
--- a/src/plugins/clangtools/clangtoolruncontrol.cpp
+++ b/src/plugins/clangtools/clangtoolruncontrol.cpp
@@ -418,7 +418,7 @@ void ClangToolRunWorker::finalize()
 {
     const QString toolName = tool()->name();
     if (m_filesNotAnalyzed.size() != 0) {
-        appendMessage(tr("Error: Failed to analyze %1 files.").arg(m_filesNotAnalyzed.size()),
+        appendMessage(tr("Error: Failed to analyze %n files.", nullptr, m_filesNotAnalyzed.size()),
                       ErrorMessageFormat);
         Target *target = runControl()->target();
         if (target && target->activeBuildConfiguration() && !target->activeBuildConfiguration()->buildDirectory().exists()
diff --git a/src/plugins/cppeditor/cppquickfixprojectsettingswidget.ui b/src/plugins/cppeditor/cppquickfixprojectsettingswidget.ui
index ec419845a13..d0c047b9b68 100644
--- a/src/plugins/cppeditor/cppquickfixprojectsettingswidget.ui
+++ b/src/plugins/cppeditor/cppquickfixprojectsettingswidget.ui
@@ -10,9 +10,6 @@
     <height>345</height>
    </rect>
   </property>
-  <property name="windowTitle">
-   <string>Form</string>
-  </property>
   <layout class="QGridLayout" name="gridLayout">
    <item row="0" column="1">
     <widget class="QPushButton" name="pushButton_custom">
diff --git a/src/plugins/cppeditor/cppquickfixsettingswidget.ui b/src/plugins/cppeditor/cppquickfixsettingswidget.ui
index 41b68d8ba96..44ad80f9180 100644
--- a/src/plugins/cppeditor/cppquickfixsettingswidget.ui
+++ b/src/plugins/cppeditor/cppquickfixsettingswidget.ui
@@ -10,9 +10,6 @@
     <height>1074</height>
    </rect>
   </property>
-  <property name="windowTitle">
-   <string>Form</string>
-  </property>
   <layout class="QVBoxLayout" name="verticalLayout_3">
    <item>
     <widget class="QGroupBox" name="groupBox_2">
diff --git a/src/plugins/qmldesigner/components/bindingeditor/signallist.cpp b/src/plugins/qmldesigner/components/bindingeditor/signallist.cpp
index 5eb9ceabfaa..f87000ddbab 100644
--- a/src/plugins/qmldesigner/components/bindingeditor/signallist.cpp
+++ b/src/plugins/qmldesigner/components/bindingeditor/signallist.cpp
@@ -96,8 +96,8 @@ void SignalList::prepareDialog()
     m_dialog = new SignalListDialog(Core::ICore::dialogParent());
     m_dialog->setAttribute(Qt::WA_DeleteOnClose);
     m_dialog->initialize(m_model);
-    m_dialog->setWindowTitle(::QmlDesigner::SignalList::tr("Signal List for ")
-                             + m_modelNode.validId());
+    m_dialog->setWindowTitle(::QmlDesigner::SignalList::tr("Signal List for %1")
+                             .arg(m_modelNode.validId()));
 
     auto *delegate = static_cast<SignalListDelegate *>(m_dialog->tableView()->itemDelegate());
     connect(delegate, &SignalListDelegate::connectClicked, this, &SignalList::connectClicked);
diff --git a/src/plugins/vcsbase/submiteditorwidget.cpp b/src/plugins/vcsbase/submiteditorwidget.cpp
index 843310f2906..714dbe59d3f 100644
--- a/src/plugins/vcsbase/submiteditorwidget.cpp
+++ b/src/plugins/vcsbase/submiteditorwidget.cpp
@@ -546,10 +546,10 @@ void SubmitEditorWidget::verifyDescription()
                        "<ul>"
                        "<li>Avoid very short commit messages.</li>"
                        "<li>Consider the first line as subject (like in email) "
-                       "and keep it shorter than %1 characters.</li>"
+                       "and keep it shorter than %n characters.</li>"
                        "<li>After an empty second line, a longer description can be added.</li>"
                        "<li>Describe why the change was done, not how it was done.</li>"
-                       "</ul>").arg(MaxSubjectLength));
+                       "</ul>", nullptr, MaxSubjectLength));
         }
 }