diff --git a/src/Gui/DlgSettings3DView.ui b/src/Gui/DlgSettings3DView.ui
index 5dabdba1b4..a4bd3e0b5f 100644
--- a/src/Gui/DlgSettings3DView.ui
+++ b/src/Gui/DlgSettings3DView.ui
@@ -408,10 +408,10 @@ The value is the diameter of the sphere to fit on the screen.</string>
            <double>10000000.000000000000000</double>
           </property>
           <property name="prefEntry" stdset="0">
-           <string>NewDocumentCameraScale</string>
+           <cstring>NewDocumentCameraScale</cstring>
           </property>
           <property name="prefPath" stdset="0">
-           <string>View</string>
+           <cstring>View</cstring>
           </property>
           <property name="rawValue" stdset="0">
            <double>100.000000000000000</double>
diff --git a/src/Gui/DlgSettingsDocument.ui b/src/Gui/DlgSettingsDocument.ui
index 5bf2e0dd13..129007a979 100644
--- a/src/Gui/DlgSettingsDocument.ui
+++ b/src/Gui/DlgSettingsDocument.ui
@@ -187,10 +187,10 @@ This feature may slightly increase recomputation time.</string>
          <string>Allow aborting recomputation</string>
         </property>
         <property name="prefEntry" stdset="0">
-         <string>CanAbortRecompute</string>
+         <cstring>CanAbortRecompute</cstring>
         </property>
         <property name="prefPath" stdset="0">
-         <string>Document</string>
+         <cstring>Document</cstring>
         </property>
        </widget>
       </item>
diff --git a/src/Mod/Fem/Gui/DlgSettingsFemExportAbaqus.ui b/src/Mod/Fem/Gui/DlgSettingsFemExportAbaqus.ui
index 55ed5e5eb7..01451d91bc 100644
--- a/src/Mod/Fem/Gui/DlgSettingsFemExportAbaqus.ui
+++ b/src/Mod/Fem/Gui/DlgSettingsFemExportAbaqus.ui
@@ -82,10 +82,10 @@ not belonging to faces and faces not belonging to volumes.</string>
            <string>element parameter: All: all elements, highest: highest elements only, FEM: FEM elements only (only edges not belonging to faces and faces not belonging to volumes)</string>
           </property>
           <property name="prefEntry" stdset="0">
-           <string>AbaqusElementChoice</string>
+           <cstring>AbaqusElementChoice</cstring>
           </property>
           <property name="prefPath" stdset="0">
-           <string>Mod/Fem/Abaqus</string>
+           <cstring>Mod/Fem/Abaqus</cstring>
           </property>
           <item>
            <property name="text">
diff --git a/src/Mod/Fem/Gui/DlgSettingsFemInOutVtk.ui b/src/Mod/Fem/Gui/DlgSettingsFemInOutVtk.ui
index 29dd63a32c..9aa94ee725 100644
--- a/src/Mod/Fem/Gui/DlgSettingsFemInOutVtk.ui
+++ b/src/Mod/Fem/Gui/DlgSettingsFemInOutVtk.ui
@@ -69,10 +69,10 @@ exported from FreeCAD.</string>
            <number>0</number>
           </property>
           <property name="prefEntry" stdset="0">
-           <string>ImportObject</string>
+           <cstring>ImportObject</cstring>
           </property>
           <property name="prefPath" stdset="0">
-           <string>Mod/Fem/InOutVtk</string>
+           <cstring>Mod/Fem/InOutVtk</cstring>
           </property>
           <item>
            <property name="text">
diff --git a/src/Mod/Part/Gui/DlgImportExportStep.ui b/src/Mod/Part/Gui/DlgImportExportStep.ui
index 110feff33d..915713a7d2 100644
--- a/src/Mod/Part/Gui/DlgImportExportStep.ui
+++ b/src/Mod/Part/Gui/DlgImportExportStep.ui
@@ -55,10 +55,10 @@
          <string>Export invisible objects</string>
         </property>
         <property name="prefEntry" stdset="0">
-         <string>ExportHiddenObject</string>
+         <cstring>ExportHiddenObject</cstring>
         </property>
         <property name="prefPath" stdset="0">
-         <string>Mod/Import</string>
+         <cstring>Mod/Import</cstring>
         </property>
        </widget>
       </item>
@@ -114,10 +114,10 @@
          <string>Use legacy exporter</string>
         </property>
         <property name="prefPath" stdset="0">
-         <string>Mod/Import</string>
+         <cstring>Mod/Import</cstring>
         </property>
         <property name="prefEntry" stdset="0">
-         <string>ExportLegacy</string>
+         <cstring>ExportLegacy</cstring>
         </property>
        </widget>
       </item>
@@ -133,10 +133,10 @@ it inside the Placement property.</string>
          <string>Export single object placement</string>
         </property>
         <property name="prefEntry" stdset="0">
-         <string>ExportKeepPlacement</string>
+         <cstring>ExportKeepPlacement</cstring>
         </property>
         <property name="prefPath" stdset="0">
-         <string>Mod/Import</string>
+         <cstring>Mod/Import</cstring>
         </property>
        </widget>
       </item>
@@ -233,10 +233,10 @@ during file reading (slower but higher details).</string>
          <string>Use LinkGroup</string>
         </property>
         <property name="prefEntry" stdset="0">
-         <string>UseLinkGroup</string>
+         <cstring>UseLinkGroup</cstring>
         </property>
         <property name="prefPath" stdset="0">
-         <string>Mod/Import</string>
+         <cstring>Mod/Import</cstring>
         </property>
        </widget>
       </item>
@@ -249,10 +249,10 @@ during file reading (slower but higher details).</string>
          <string>Import invisible objects</string>
         </property>
         <property name="prefEntry" stdset="0">
-         <string>ImportHiddenObject</string>
+         <cstring>ImportHiddenObject</cstring>
         </property>
         <property name="prefPath" stdset="0">
-         <string>Mod/Import</string>
+         <cstring>Mod/Import</cstring>
         </property>
        </widget>
       </item>
@@ -265,10 +265,10 @@ during file reading (slower but higher details).</string>
          <string>Reduce number of objects</string>
         </property>
         <property name="prefEntry" stdset="0">
-         <string>ReduceObjects</string>
+         <cstring>ReduceObjects</cstring>
         </property>
         <property name="prefPath" stdset="0">
-         <string>Mod/Import</string>
+         <cstring>Mod/Import</cstring>
         </property>
        </widget>
       </item>
@@ -281,10 +281,10 @@ during file reading (slower but higher details).</string>
          <string>Expand compound shape</string>
         </property>
         <property name="prefEntry" stdset="0">
-         <string>ExpandCompound</string>
+         <cstring>ExpandCompound</cstring>
         </property>
         <property name="prefPath" stdset="0">
-         <string>Mod/Import</string>
+         <cstring>Mod/Import</cstring>
         </property>
        </widget>
       </item>
@@ -297,10 +297,10 @@ during file reading (slower but higher details).</string>
          <string>Show progress bar when importing</string>
         </property>
         <property name="prefEntry" stdset="0">
-         <string>ShowProgress</string>
+         <cstring>ShowProgress</cstring>
         </property>
         <property name="prefPath" stdset="0">
-         <string>Mod/Import</string>
+         <cstring>Mod/Import</cstring>
         </property>
        </widget>
       </item>
@@ -313,10 +313,10 @@ during file reading (slower but higher details).</string>
          <string>Ignore instance names</string>
         </property>
         <property name="prefEntry" stdset="0">
-         <string>UseBaseName</string>
+         <cstring>UseBaseName</cstring>
         </property>
         <property name="prefPath" stdset="0">
-         <string>Mod/Import</string>
+         <cstring>Mod/Import</cstring>
         </property>
        </widget>
       </item>
@@ -338,10 +338,10 @@ during file reading (slower but higher details).</string>
            </sizepolicy>
           </property>
           <property name="prefEntry" stdset="0">
-           <string>ImportMode</string>
+           <cstring>ImportMode</cstring>
           </property>
           <property name="prefPath" stdset="0">
-           <string>Mod/Import</string>
+           <cstring>Mod/Import</cstring>
           </property>
           <item>
            <property name="text">
diff --git a/src/Mod/Path/Gui/DlgSettingsPathColor.ui b/src/Mod/Path/Gui/DlgSettingsPathColor.ui
index 7477b0932c..fe18cf2843 100644
--- a/src/Mod/Path/Gui/DlgSettingsPathColor.ui
+++ b/src/Mod/Path/Gui/DlgSettingsPathColor.ui
@@ -406,10 +406,10 @@
       <item row="1" column="1">
        <widget class="Gui::PrefComboBox" name="DefaultTaskPanelLayout">
         <property name="prefEntry" stdset="0">
-         <string>DefaultTaskPanelLayout</string>
+         <cstring>DefaultTaskPanelLayout</cstring>
         </property>
         <property name="prefPath" stdset="0">
-         <string>Mod/Path</string>
+         <cstring>Mod/Path</cstring>
         </property>
         <item>
          <property name="text">