diff --git a/src/org/omegat/Bundle.properties b/src/org/omegat/Bundle.properties
index 136ce39815..86a5558162 100644
--- a/src/org/omegat/Bundle.properties
+++ b/src/org/omegat/Bundle.properties
@@ -1734,7 +1734,7 @@ CORE_SRX_RULES_LANG_DEFAULT=Default
 CORE_SRX_RULES_FORMATTING_TEXT=Text files segmentation
 CORE_SRX_RULES_FORMATTING_HTML=HTML, XHTML, ODF and Infix segmentation
 
-CORE_SRX_RULES_UNKNOWN_LANGUAGE_CODE=Unknown language code {0} specified
+CORE_SRX_RULES_UNKNOWN_LANGUAGE_CODE=Unknown language code '{0}' specified
 
 # org.omegat.core.spellchecker.SpellCheckerManager
 CORE_SPELLCHECKER_NO_ENGINE=No active spell checker engine found
diff --git a/src/org/omegat/Bundle_de.properties b/src/org/omegat/Bundle_de.properties
index f9d996d86e..7821a2537c 100644
--- a/src/org/omegat/Bundle_de.properties
+++ b/src/org/omegat/Bundle_de.properties
@@ -1545,6 +1545,7 @@ CORE_SRX_RULES_LANG_DEFAULT=Standard
 CORE_SRX_RULES_FORMATTING_TEXT=Segmentierung von Textdateien
 CORE_SRX_RULES_FORMATTING_HTML=Segmentierung von HTML-, XHTML-, ODF- und Infix-Dateien
 
+CORE_SRX_RULES_UNKNOWN_LANGUAGE_CODE=Unbekannter Sprachcode '{0}' spezifiziert
 
 # org.omegat.segmentation.SegmentationCustomizer
 
diff --git a/src/org/omegat/Bundle_it.properties b/src/org/omegat/Bundle_it.properties
index e2735820b6..5cd735ab1d 100644
--- a/src/org/omegat/Bundle_it.properties
+++ b/src/org/omegat/Bundle_it.properties
@@ -1555,7 +1555,7 @@ CORE_SRX_RULES_LANG_DEFAULT=Predefinito
 CORE_SRX_RULES_FORMATTING_TEXT=Segmentazione file di testo
 CORE_SRX_RULES_FORMATTING_HTML=Segmentazione HTML, XHTML, ODF e Infix
 
-CORE_SRX_RULES_UNKNOWN_LANGUAGE_CODE=Il codice di lingua {0} specificato \u00e8 sconosciuto
+CORE_SRX_RULES_UNKNOWN_LANGUAGE_CODE=Il codice di lingua '{0}' specificato \u00e8 sconosciuto
 
 # org.omegat.core.spellchecker.SpellCheckerManager
 CORE_SPELLCHECKER_NO_ENGINE=Non \u00e8 stato trovato alcun motore attivo per il correttore ortografico
diff --git a/src/org/omegat/Bundle_nl.properties b/src/org/omegat/Bundle_nl.properties
index b9e6ccce58..adfd5f1559 100644
--- a/src/org/omegat/Bundle_nl.properties
+++ b/src/org/omegat/Bundle_nl.properties
@@ -1555,7 +1555,7 @@ CORE_SRX_RULES_LANG_DEFAULT=Standaard
 CORE_SRX_RULES_FORMATTING_TEXT=Segmentatie van tekstbestanden
 CORE_SRX_RULES_FORMATTING_HTML=segmentatie voor HTML, XHTML, ODF en Infix
 
-CORE_SRX_RULES_UNKNOWN_LANGUAGE_CODE=Onbekende taalcode {0} gespecificeerd
+CORE_SRX_RULES_UNKNOWN_LANGUAGE_CODE=Onbekende taalcode '{0}' gespecificeerd
 
 # org.omegat.core.spellchecker.SpellCheckerManager
 CORE_SPELLCHECKER_NO_ENGINE=Geen actief programma voor spellingscontrole gevonden