diff --git a/src/Task.cpp b/src/Task.cpp
index 83b65cad6..6ed35304f 100644
--- a/src/Task.cpp
+++ b/src/Task.cpp
@@ -2106,7 +2106,7 @@ void Task::modify (modType type, bool text_required /* = false */)
           Column* column = context.columns[name];
           if (! column ||
               ! column->modifiable ())
-            throw format (STRING_INVALID_MOD, name, value);
+            throw format ("The '{1}' attribute does not allow a value of '{2}'.", name, value);
 
           // Delegate modification to the column object or their base classes.
           if (name == "depends"             ||
diff --git a/src/columns/ColTypeString.cpp b/src/columns/ColTypeString.cpp
index 4725b89d1..0b1a79771 100644
--- a/src/columns/ColTypeString.cpp
+++ b/src/columns/ColTypeString.cpp
@@ -31,7 +31,8 @@
 #include <Variant.h>
 #include <Filter.h>
 #include <format.h>
-#include <i18n.h>
+
+#define STRING_INVALID_MOD           "The '{1}' attribute does not allow a value of '{2}'."
 
 extern Context context;
 extern Task& contextTask;
diff --git a/src/l10n/deu-DEU.h b/src/l10n/deu-DEU.h
index 957974552..fc03fb14c 100644
--- a/src/l10n/deu-DEU.h
+++ b/src/l10n/deu-DEU.h
@@ -473,7 +473,6 @@
 
 // Errors
 // TODO Move each of these to appropriate section.
-#define STRING_INVALID_MOD           "Die '{1}'-Eigenschaft erlaubt keinen Wert '{2}'."
 #define STRING_ERROR_DETAILS         "Die Option 'calendar.details.report' muss einen einzelnen Report-Namen enthalten."
 #define STRING_ERROR_NO_FILTER       "Command line filters are not supported by this command."
 
diff --git a/src/l10n/eng-USA.h b/src/l10n/eng-USA.h
index b7bde5d3d..8e3eb960e 100644
--- a/src/l10n/eng-USA.h
+++ b/src/l10n/eng-USA.h
@@ -470,7 +470,6 @@
 
 // Errors
 // TODO Move each of these to appropriate section.
-#define STRING_INVALID_MOD           "The '{1}' attribute does not allow a value of '{2}'."
 #define STRING_ERROR_DETAILS         "The setting 'calendar.details.report' must contain a single report name."
 #define STRING_ERROR_NO_FILTER       "Command line filters are not supported by this command."
 
diff --git a/src/l10n/epo-RUS.h b/src/l10n/epo-RUS.h
index 057a89cd8..77e977396 100644
--- a/src/l10n/epo-RUS.h
+++ b/src/l10n/epo-RUS.h
@@ -473,7 +473,6 @@
 
 // Errors
 // TODO Move each of these to appropriate section.
-#define STRING_INVALID_MOD           "Atributo '{1}' ne permesas valoron '{2}'."
 #define STRING_ERROR_DETAILS         "Agordo 'calendar.details.report' devas enhavi sole unu raportnomon."
 #define STRING_ERROR_NO_FILTER       "Command line filters are not supported by this command."
 
diff --git a/src/l10n/esp-ESP.h b/src/l10n/esp-ESP.h
index 170173f2b..c2588ada1 100644
--- a/src/l10n/esp-ESP.h
+++ b/src/l10n/esp-ESP.h
@@ -485,7 +485,6 @@
 
 // Errors
 // TODO Move each of these to appropriate section.
-#define STRING_INVALID_MOD           "El atributo '{1}' no admite un valor '{2}'."
 #define STRING_ERROR_DETAILS         "El ajuste 'calendar.details.report' debe contener un único nombre de informe."
 #define STRING_ERROR_NO_FILTER       "Los filtros de línea de comando no están soportados por este comando."
 
diff --git a/src/l10n/fra-FRA.h b/src/l10n/fra-FRA.h
index fc37bdef8..40a283ffc 100644
--- a/src/l10n/fra-FRA.h
+++ b/src/l10n/fra-FRA.h
@@ -495,7 +495,6 @@
 
 // Errors
 // TODO Move each of these to appropriate section.
-#define STRING_INVALID_MOD           "The '{1}' attribute does not allow a value of '{2}'."
 #define STRING_ERROR_DETAILS         "The setting 'calendar.details.report' must contain a single report name."
 #define STRING_ERROR_NO_FILTER       "Command line filters are not supported by this command."
 
diff --git a/src/l10n/ita-ITA.h b/src/l10n/ita-ITA.h
index 56fd3711d..3d536d608 100644
--- a/src/l10n/ita-ITA.h
+++ b/src/l10n/ita-ITA.h
@@ -474,7 +474,6 @@
 
 // Errors
 // TODO Move each of these to appropriate section.
-#define STRING_INVALID_MOD           "L'attributo '{1}' non ammette un valore pari a '{2}'."
 #define STRING_ERROR_DETAILS         "The setting 'calendar.details.report' must contain a single report name."
 #define STRING_ERROR_NO_FILTER       "Command line filters are not supported by this command."
 
diff --git a/src/l10n/jpn-JPN.h b/src/l10n/jpn-JPN.h
index 472c438ac..2ac27442f 100644
--- a/src/l10n/jpn-JPN.h
+++ b/src/l10n/jpn-JPN.h
@@ -475,7 +475,6 @@
 
 // Errors
 // TODO Move each of these to appropriate section.
-#define STRING_INVALID_MOD           "The '{1}' attribute does not allow a value of '{2}'."
 #define STRING_ERROR_DETAILS         "The setting 'calendar.details.report' must contain a single report name."
 #define STRING_ERROR_NO_FILTER       "Command line filters are not supported by this command."
 
diff --git a/src/l10n/pol-POL.h b/src/l10n/pol-POL.h
index b688dccb6..2daad7f08 100644
--- a/src/l10n/pol-POL.h
+++ b/src/l10n/pol-POL.h
@@ -475,7 +475,6 @@
 
 // Errors
 // TODO Move each of these to appropriate section.
-#define STRING_INVALID_MOD           "Atrybut '{1}' nie zezwala na wartość '{2}'."
 #define STRING_ERROR_DETAILS         "Zmienna 'calendar.details.report' musi zawierać nazwę raportu."
 #define STRING_ERROR_NO_FILTER       "Command line filters are not supported by this command."
 
diff --git a/src/l10n/por-PRT.h b/src/l10n/por-PRT.h
index bc579d2df..9b6840ca4 100644
--- a/src/l10n/por-PRT.h
+++ b/src/l10n/por-PRT.h
@@ -475,7 +475,6 @@
 
 // Errors
 // TODO Move each of these to appropriate section.
-#define STRING_INVALID_MOD           "O atributo '{1}' não permite o valor '{2}'."
 #define STRING_ERROR_DETAILS         "A definição 'calendar.details.report' pode apenas indicar um nome de relatório."
 #define STRING_ERROR_NO_FILTER       "Command line filters are not supported by this command."