diff --git a/src/columns/ColRecur.cpp b/src/columns/ColRecur.cpp
index 27bbc40fb..57e2350af 100644
--- a/src/columns/ColRecur.cpp
+++ b/src/columns/ColRecur.cpp
@@ -127,7 +127,7 @@ void ColumnRecur::modify (Task& task, const std::string& value)
     task.set (_name, value);
   }
   else
-    throw format (STRING_TASK_INVALID_DUR, value);
+    throw format ("The duration value '{1}' is not supported.", value);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
diff --git a/src/columns/ColTypeDuration.cpp b/src/columns/ColTypeDuration.cpp
index 8bf134678..a869dcfc5 100644
--- a/src/columns/ColTypeDuration.cpp
+++ b/src/columns/ColTypeDuration.cpp
@@ -31,7 +31,6 @@
 #include <Variant.h>
 #include <Filter.h>
 #include <format.h>
-#include <i18n.h>
 
 extern Context context;
 extern Task& contextTask;
@@ -76,7 +75,7 @@ void ColumnTypeDuration::modify (Task& task, const std::string& value)
     task.set (_name, evaluatedValue);
   }
   else
-    throw format (STRING_TASK_INVALID_DUR, value);
+    throw format ("The duration value '{1}' is not supported.", value);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
diff --git a/src/l10n/deu-DEU.h b/src/l10n/deu-DEU.h
index f4f500e03..786e5b0c2 100644
--- a/src/l10n/deu-DEU.h
+++ b/src/l10n/deu-DEU.h
@@ -787,7 +787,6 @@
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "Befehl an Ausführung gehindert."
 #define STRING_TASK_SAFETY_ALLOW     "Kein Filter angegeben, und durch den konfigurierten 'allow.empty.filter'-Wert wurde keine Aktion durchgeführt."
-#define STRING_TASK_INVALID_DUR      "Zeitdauer '{1}' nicht unterstützt."
 #define STRING_TASK_INVALID_COL_TYPE "Nicht erkannter Typ '{1}' für Spalte '{2}'"
 
 // TDB2
diff --git a/src/l10n/eng-USA.h b/src/l10n/eng-USA.h
index ede96264a..386cc84a6 100644
--- a/src/l10n/eng-USA.h
+++ b/src/l10n/eng-USA.h
@@ -785,7 +785,6 @@
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "Command prevented from running."
 #define STRING_TASK_SAFETY_ALLOW     "You did not specify a filter, and with the 'allow.empty.filter' value, no action is taken."
-#define STRING_TASK_INVALID_DUR      "The duration value '{1}' is not supported."
 #define STRING_TASK_INVALID_COL_TYPE "Unrecognized column type '{1}' for column '{2}'"
 
 // TDB2
diff --git a/src/l10n/epo-RUS.h b/src/l10n/epo-RUS.h
index 8f171bfbe..e5a132a5e 100644
--- a/src/l10n/epo-RUS.h
+++ b/src/l10n/epo-RUS.h
@@ -787,7 +787,6 @@
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "Antaŭmalebligis komandon."
 #define STRING_TASK_SAFETY_ALLOW     "Vi ne specifis filtrilon. Laŭ la valoro 'allow.empty.filter', ne faros nenion."
-#define STRING_TASK_INVALID_DUR      "The duration value '{1}' is not supported."
 #define STRING_TASK_INVALID_COL_TYPE "Unrecognized column type '{1}' for column '{2}'"
 
 // TDB2
diff --git a/src/l10n/esp-ESP.h b/src/l10n/esp-ESP.h
index 645a8e54d..9d75d9ef1 100644
--- a/src/l10n/esp-ESP.h
+++ b/src/l10n/esp-ESP.h
@@ -799,7 +799,6 @@
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "Se impidió la ejecución del comando."
 #define STRING_TASK_SAFETY_ALLOW     "No especificó un filtro, y con el valor de 'allow.empty.filter', no se toma ninguna acción."
-#define STRING_TASK_INVALID_DUR      "El valor de duración '{1}' no está soportado."
 #define STRING_TASK_INVALID_COL_TYPE "Tipo de columna no reconocido '{1}' para la columna '{2}'"
 
 // TDB2
diff --git a/src/l10n/fra-FRA.h b/src/l10n/fra-FRA.h
index efc716dc0..0bb114a2f 100644
--- a/src/l10n/fra-FRA.h
+++ b/src/l10n/fra-FRA.h
@@ -789,7 +789,6 @@
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "Command prevented from running."
 #define STRING_TASK_SAFETY_ALLOW     "You did not specify a filter, and with the 'allow.empty.filter' value, no action is taken."
-#define STRING_TASK_INVALID_DUR      "The duration value '{1}' is not supported."
 #define STRING_TASK_INVALID_COL_TYPE "Unrecognized column type '{1}' for column '{2}'"
 
 // TDB2
diff --git a/src/l10n/ita-ITA.h b/src/l10n/ita-ITA.h
index 546d4d2b6..50ae3234e 100644
--- a/src/l10n/ita-ITA.h
+++ b/src/l10n/ita-ITA.h
@@ -788,7 +788,6 @@
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "Prevenuta l'esecuzione del comando."
 #define STRING_TASK_SAFETY_ALLOW     "You did not specify a filter, and with the 'allow.empty.filter' value, no action is taken."
-#define STRING_TASK_INVALID_DUR      "The duration value '{1}' is not supported."
 #define STRING_TASK_INVALID_COL_TYPE "Unrecognized column type '{1}' for column '{2}'"
 
 // TDB2
diff --git a/src/l10n/jpn-JPN.h b/src/l10n/jpn-JPN.h
index 4c7ac1fc7..37610bb3a 100644
--- a/src/l10n/jpn-JPN.h
+++ b/src/l10n/jpn-JPN.h
@@ -789,7 +789,6 @@
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "コマンドの実行は中止された。"
 #define STRING_TASK_SAFETY_ALLOW     "You did not specify a filter, and with the 'allow.empty.filter' value, no action is taken."
-#define STRING_TASK_INVALID_DUR      "The duration value '{1}' is not supported."
 #define STRING_TASK_INVALID_COL_TYPE "Unrecognized column type '{1}' for column '{2}'"
 
 // TDB2
diff --git a/src/l10n/pol-POL.h b/src/l10n/pol-POL.h
index a2f331f54..4661dfab9 100644
--- a/src/l10n/pol-POL.h
+++ b/src/l10n/pol-POL.h
@@ -789,7 +789,6 @@
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "Niedopuszczono do wykonania polecenia."
 #define STRING_TASK_SAFETY_ALLOW     "Brak filtra, z aktywną flagą 'allow.empty.filter', nie podjęto akcji."
-#define STRING_TASK_INVALID_DUR      "Wartość czas trwania '{1}' jest niewspierana."
 #define STRING_TASK_INVALID_COL_TYPE "Nierozpoznany typ kolumny '{1}' dla kolumny '{2}'"
 
 // TDB2
diff --git a/src/l10n/por-PRT.h b/src/l10n/por-PRT.h
index 07088af31..3ca655a3b 100644
--- a/src/l10n/por-PRT.h
+++ b/src/l10n/por-PRT.h
@@ -789,7 +789,6 @@
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "Execução do comando abortada."
 #define STRING_TASK_SAFETY_ALLOW     "Não especificou um filtro e com o valor de 'allow.empty.filter', nenhuma ação foi tomada."
-#define STRING_TASK_INVALID_DUR      "The duration value '{1}' is not supported."
 #define STRING_TASK_INVALID_COL_TYPE "Unrecognized column type '{1}' for column '{2}'"
 
 // TDB2