diff --git a/UI/MailerUI/Dutch.lproj/Localizable.strings b/UI/MailerUI/Dutch.lproj/Localizable.strings
index 6ab842000..e9740ce92 100644
--- a/UI/MailerUI/Dutch.lproj/Localizable.strings
+++ b/UI/MailerUI/Dutch.lproj/Localizable.strings
@@ -204,6 +204,17 @@
 "Please select a message to print." = "Selecteer een bericht om af te drukken.";
 "Please select only one message to print." = "Selecteer een enkel bericht om af te drukken.";
 
+"The folder with name \"%{0}\" could not be created."
+= "The folder with name \"%{0}\" could not be created.";
+"This folder could not be renamed to \"%{0}\"."
+= "This folder could not be renamed to \"%{0}\".";
+"The folder could not be deleted."
+= "The folder could not be deleted.";
+"The trash could not be emptied."
+= "The trash could not be emptied.";
+"The folder functionality could not be changed."
+= "The folder functionality could not be changed.";
+
 "You need to choose a non-virtual folder!" = "U dient een niet-virtuele map te kiezen!";
 
 "Moving a message into its own folder is impossible!"
diff --git a/UI/MailerUI/English.lproj/Localizable.strings b/UI/MailerUI/English.lproj/Localizable.strings
index 5e348b6a4..13ab1be61 100644
--- a/UI/MailerUI/English.lproj/Localizable.strings
+++ b/UI/MailerUI/English.lproj/Localizable.strings
@@ -220,6 +220,18 @@
 "Please select a message to print." = "Please select a message to print.";
 "Please select only one message to print." = "Please select only one message to print.";
 
+
+"The folder with name \"%{0}\" could not be created."
+= "The folder with name \"%{0}\" could not be created.";
+"This folder could not be renamed to \"%{0}\"."
+= "This folder could not be renamed to \"%{0}\".";
+"The folder could not be deleted."
+= "The folder could not be deleted.";
+"The trash could not be emptied."
+= "The trash could not be emptied.";
+"The folder functionality could not be changed."
+= "The folder functionality could not be changed.";
+
 "You need to choose a non-virtual folder!" = "You need to choose a non-virtual folder!";
 
 "Moving a message into its own folder is impossible!"
diff --git a/UI/MailerUI/French.lproj/Localizable.strings b/UI/MailerUI/French.lproj/Localizable.strings
index f2c4d6797..ed775da32 100644
--- a/UI/MailerUI/French.lproj/Localizable.strings
+++ b/UI/MailerUI/French.lproj/Localizable.strings
@@ -221,6 +221,17 @@
 "Please select a message to print." = "Veuillez sélectionner un message à imprimer.";
 "Please select only one message to print." = "Veuillez ne sélectionner qu'un seul message à imprimer.";
 
+"The folder with name \"%{0}\" could not be created."
+= "Le dossier intitulé \"%{0}\" n'a pas pu être créé.";
+"This folder could not be renamed to \"%{0}\"."
+= "Ce dossier n'a pu être renommé en \"%{0}\".";
+"The folder could not be deleted."
+= "Le dossier n'a pas pu être effacé.";
+"The trash could not be emptied."
+= "La corbeille n'a pas pu être vidée.";
+"The folder functionality could not be changed."
+= "La fonctionnalité du dossier n'a pas pu être changée.";
+
 "You need to choose a non-virtual folder!" = "Vous devez choisir un dossier non-virtuel.";
 
 "Moving a message into its own folder is impossible!"
diff --git a/UI/MailerUI/German.lproj/Localizable.strings b/UI/MailerUI/German.lproj/Localizable.strings
index 5bbd718cd..8b92a793f 100644
--- a/UI/MailerUI/German.lproj/Localizable.strings
+++ b/UI/MailerUI/German.lproj/Localizable.strings
@@ -204,6 +204,17 @@
 "Please select a message to print." = "Sie müssen eine Nachricht zum Drucken auswählen.";
 "Please select only one message to print." = "Bitte wählen Sie nur eine Nachricht zum Drucken aus.";
 
+"The folder with name \"%{0}\" could not be created."
+= "The folder with name \"%{0}\" could not be created.";
+"This folder could not be renamed to \"%{0}\"."
+= "This folder could not be renamed to \"%{0}\".";
+"The folder could not be deleted."
+= "The folder could not be deleted.";
+"The trash could not be emptied."
+= "The trash could not be emptied.";
+"The folder functionality could not be changed."
+= "The folder functionality could not be changed.";
+
 "You need to choose a non-virtual folder!" = "Sie müssen einen nicht-virtuellen Ordner auswählen!";
 
 "Moving a message into its own folder is impossible!"
diff --git a/UI/MailerUI/Italian.lproj/Localizable.strings b/UI/MailerUI/Italian.lproj/Localizable.strings
index c47208097..b1c61b0bd 100644
--- a/UI/MailerUI/Italian.lproj/Localizable.strings
+++ b/UI/MailerUI/Italian.lproj/Localizable.strings
@@ -227,6 +227,17 @@
 "Please select a message to print." = "Per favore seleziona un messaggio da stampare.";
 "Please select only one message to print." = "Per favore seleziona un solo messaggio da stampare.";
 
+"The folder with name \"%{0}\" could not be created."
+= "The folder with name \"%{0}\" could not be created.";
+"This folder could not be renamed to \"%{0}\"."
+= "This folder could not be renamed to \"%{0}\".";
+"The folder could not be deleted."
+= "The folder could not be deleted.";
+"The trash could not be emptied."
+= "The trash could not be emptied.";
+"The folder functionality could not be changed."
+= "The folder functionality could not be changed.";
+
 "You need to choose a non-virtual folder!" = "Devi selezionare una cartella fisica, non virtuale!";
 
 "Moving a message into its own folder is impossible!"
diff --git a/UI/MailerUI/Spanish.lproj/Localizable.strings b/UI/MailerUI/Spanish.lproj/Localizable.strings
index 3fadf9fd3..3cad5cc2f 100644
--- a/UI/MailerUI/Spanish.lproj/Localizable.strings
+++ b/UI/MailerUI/Spanish.lproj/Localizable.strings
@@ -223,6 +223,17 @@
 "Please select a message to print." = "Seleccione el mensaje que desea imprimir.";
 "Please select only one message to print." = "Para imprimir, seleccione sólo un mensaje.";
 
+"The folder with name \"%{0}\" could not be created."
+= "The folder with name \"%{0}\" could not be created.";
+"This folder could not be renamed to \"%{0}\"."
+= "This folder could not be renamed to \"%{0}\".";
+"The folder could not be deleted."
+= "The folder could not be deleted.";
+"The trash could not be emptied."
+= "The trash could not be emptied.";
+"The folder functionality could not be changed."
+= "The folder functionality could not be changed.";
+
 "You need to choose a non-virtual folder!" = "Ha de seleccionar una carpeta no virtual.";
 
 "Moving a message into its own folder is impossible!"
diff --git a/UI/WebServerResources/MailerUI.js b/UI/WebServerResources/MailerUI.js
index 1b6f17ad5..72883cc56 100644
--- a/UI/WebServerResources/MailerUI.js
+++ b/UI/WebServerResources/MailerUI.js
@@ -1581,18 +1581,21 @@ function onMenuCreateFolder(event) {
   if (name && name.length > 0) {
     var folderID = document.menuTarget.getAttribute("dataname");
     var urlstr = URLForFolderID(folderID) + "/createFolder?name=" + name;
-    triggerAjaxRequest(urlstr, folderOperationCallback);
+    var errorLabel = labels["The folder with name \"%{0}\" could not be created."];
+    triggerAjaxRequest(urlstr, folderOperationCallback,
+                       errorLabel.formatted(name));
   }
 }
 
 function onMenuRenameFolder(event) {
-  var name = window.prompt(labels["Enter the new name of your folder :"]
-			   ,
-			   "");
+  var name = window.prompt(labels["Enter the new name of your folder :"],
+                           "");
   if (name && name.length > 0) {
     var folderID = document.menuTarget.getAttribute("dataname");
     var urlstr = URLForFolderID(folderID) + "/renameFolder?name=" + name;
-    triggerAjaxRequest(urlstr, folderOperationCallback);
+    var errorLabel = labels["This folder could not be renamed to \"%{0}\"."];
+    triggerAjaxRequest(urlstr, folderOperationCallback,
+                       errorLabel.formatted(name));
   }
 }
 
@@ -1601,7 +1604,8 @@ function onMenuDeleteFolder(event) {
   if (answer) {
     var folderID = document.menuTarget.getAttribute("dataname");
     var urlstr = URLForFolderID(folderID) + "/deleteFolder";
-    triggerAjaxRequest(urlstr, folderOperationCallback);
+    var errorLabel = labels["The folder could not be deleted."];
+    triggerAjaxRequest(urlstr, folderOperationCallback, errorLabel);
   }
 }
 
@@ -1614,7 +1618,8 @@ function onMenuExpungeFolder(event) {
 function onMenuEmptyTrash(event) {
   var folderID = document.menuTarget.getAttribute("dataname");
   var urlstr = URLForFolderID(folderID) + "/emptyTrash";
-  triggerAjaxRequest(urlstr, folderOperationCallback, folderID);
+  var errorLabel = labels["The trash could not be emptied."];
+  triggerAjaxRequest(urlstr, folderOperationCallback, errorLabel);
 
   if (folderID == Mailer.currentMailbox) {
     var div = $('messageContent');
@@ -1634,7 +1639,8 @@ function _onMenuChangeToXXXFolder(event, folder) {
   else {
     var folderID = document.menuTarget.getAttribute("dataname");
     var urlstr = URLForFolderID(folderID) + "/setAs" + folder + "Folder";
-    triggerAjaxRequest(urlstr, folderOperationCallback);
+    var errorLabel = labels["The folder functionality could not be changed."];
+    triggerAjaxRequest(urlstr, folderOperationCallback, errorLabel);
   }
 }
 
@@ -1731,7 +1737,7 @@ function folderOperationCallback(http) {
       && isHttpStatus204(http.status))
     initMailboxTree();
   else
-    window.alert(labels["Operation failed"]);
+    window.alert(http.callbackData);
 }
 
 function folderRefreshCallback(http) {