Index: DamClients/DamUI/trunk/src/Dam/Tests/StiImporter/StiFileValidatorTest.cs
===================================================================
diff -u -r3008 -r3019
--- DamClients/DamUI/trunk/src/Dam/Tests/StiImporter/StiFileValidatorTest.cs	(.../StiFileValidatorTest.cs)	(revision 3008)
+++ DamClients/DamUI/trunk/src/Dam/Tests/StiImporter/StiFileValidatorTest.cs	(.../StiFileValidatorTest.cs)	(revision 3019)
@@ -113,7 +113,7 @@
             var messages = fileValidator.Validate();
 
             // Then
-            string expectedErrorMessage = $"{propertyName} data in '{filePath}' is of a version of D-Geo Stability that is not supported and cannot be read";
+            string expectedErrorMessage = $"{propertyName} data in '{filePath}' is of a version of D-Geo Stability that is not supported and cannot be read.";
             CollectionAssert.AreEqual(new[]
             {
                 expectedErrorMessage
Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/StiImporter/StiFileValidator.cs
===================================================================
diff -u -r3008 -r3019
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/StiImporter/StiFileValidator.cs	(.../StiFileValidator.cs)	(revision 3008)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/StiImporter/StiFileValidator.cs	(.../StiFileValidator.cs)	(revision 3019)
@@ -24,6 +24,7 @@
 using System.IO;
 using System.Linq;
 using Deltares.Geotechnics.IO.Importers;
+using Deltares.Standard.Language;
 
 namespace Deltares.Dam.Data.StiImporter
 {
@@ -77,21 +78,22 @@
         {
             if (fileInfo.DSerieFileType != DSerieFileType.DGeoStability)
             {
+                string messageFormat = LocalizationManager.GetTranslatedText(this, "ValidateStiFileNotAStiFile");
                 return new[]
                 {
-                    $"{filePath} is not a D-Geo Stability file (*.sti)."
+                    string.Format(messageFormat, filePath)
                 };
             }
 
             var messages = new List<string>();
             if (!IsVersionValid(fileInfo.SoilVersionNumber, HighestSupportedSoilVersion))
             {
-                messages.Add(GenerateUnsupportedVersionMessage("Soil"));
+                messages.Add(GenerateUnsupportedVersionMessage(LocalizationManager.GetTranslatedText(this, "SoilDataName")));
             }
 
             if (!IsVersionValid(fileInfo.GeometryVersionNumber, HighestSupportedGeometryVersion))
             {
-                messages.Add(GenerateUnsupportedVersionMessage("Geometry"));
+                messages.Add(GenerateUnsupportedVersionMessage(LocalizationManager.GetTranslatedText(this, "GeometryDataName")));
             }
 
             return messages;
@@ -118,7 +120,8 @@
 
         private string GenerateUnsupportedVersionMessage(string propertyName)
         {
-            return($"{propertyName} data in '{filePath}' is of a version of D-Geo Stability that is not supported and cannot be read");
+            string messageFormat = LocalizationManager.GetTranslatedText(this, "ValidateStiFileUnsupportedVersion");
+            return string.Format(messageFormat, propertyName, filePath);
         }
 
         private static bool IsVersionValid(int versionNumber, int highestSupportedVersionNumber)
Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/Translations.xml
===================================================================
diff -u -r3017 -r3019
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/Translations.xml	(.../Translations.xml)	(revision 3017)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/Translations.xml	(.../Translations.xml)	(revision 3019)
@@ -581,4 +581,8 @@
   <Translation ID="ImportSoilProfileError" en-US="'{0}' contains undefined soils." nl-NL="'{0}' bevat ongedefinieerde materialen." />
   <Translation ID="ReadUnsupportedStiFile" en-US="'{0}' is an unsupported file." nl-NL="Bestand '{0}' wordt niet ondersteund." />
   <Translation ID="ReadStiFileFailed" en-US="Reading file '{0}' failed: {1}." nl-NL="Het lezen van bestand '{0}' is mislukt: {1}." />
+  <Translation ID="ValidateStiFileUnsupportedVersion" en-US="{0} data in '{1}' is of a version of D-Geo Stability that is not supported and cannot be read." nl-NL="{0} data in '{1}'  is van een versie van D-Geo Stability die niet ondersteund wordt en kan niet gelezen worden." />
+  <Translation ID="ValidateStiFileNotAStiFile" en-US="{0} is not a D-Geo Stability file (*.sti)." nl-NL="{0} is geen D-Geo Stability bestand (*.sti)." />
+  <Translation ID="SoilDataName" en-US="Soil" nl-NL="Materiaal" />
+  <Translation ID="GeometryDataName" en-US="Geometry" nl-NL="Geometrie" />
 </Translations>
\ No newline at end of file
Index: DamClients/DamUI/trunk/src/Dam/Tests/StiImporter/StiFileReaderTest.cs
===================================================================
diff -u -r3018 -r3019
--- DamClients/DamUI/trunk/src/Dam/Tests/StiImporter/StiFileReaderTest.cs	(.../StiFileReaderTest.cs)	(revision 3018)
+++ DamClients/DamUI/trunk/src/Dam/Tests/StiImporter/StiFileReaderTest.cs	(.../StiFileReaderTest.cs)	(revision 3019)
@@ -73,7 +73,7 @@
             Assert.That(call, Throws.Exception.TypeOf<StiFileReadException>()
                 .With.Message.EqualTo($"'{filePath}' is an unsupported file."));
             
-            string expectedMessage = $"Soil data in '{filePath}' is of a version of D-Geo Stability that is not supported and cannot be read";
+            string expectedMessage = $"Soil data in '{filePath}' is of a version of D-Geo Stability that is not supported and cannot be read.";
             CollectionAssert.AreEqual(new[]
             {
                 expectedMessage