diff --git a/UI/MailPartViewers/English.lproj/Localizable.strings b/UI/MailPartViewers/English.lproj/Localizable.strings
index 62c5dc013a..ad077e8722 100644
--- a/UI/MailPartViewers/English.lproj/Localizable.strings
+++ b/UI/MailPartViewers/English.lproj/Localizable.strings
@@ -34,8 +34,6 @@ reply_info = "This is a reply to an event invitation done by you.";
 "to" = "to";
 "Untitled" = "Untitled";
 "Size" = "Size";
-"Digital signature is not valid" = "Digital signature is not valid";
-"Message is signed" = "Message is signed";
 "Subject" = "Subject";
 "From" = "From";
 "Date" = "Date";
diff --git a/UI/MailerUI/English.lproj/Localizable.strings b/UI/MailerUI/English.lproj/Localizable.strings
index 205567085d..8785ac9ab4 100644
--- a/UI/MailerUI/English.lproj/Localizable.strings
+++ b/UI/MailerUI/English.lproj/Localizable.strings
@@ -269,6 +269,15 @@
 /* Trying to access a non-existent certificate */
 "No certificate associated to account." = "No certificate associated to account.";
 
+/* Invalid message signature */
+"Digital signature is not valid" = "Digital signature is not valid";
+
+/* Valid message signature */
+"Message is signed" = "Message is signed";
+
+/* Unknown error while validating message signature */
+"No error information available" = "No error information available";
+
 "This Folder" = "This Folder";
 
 /* Label popup menu */