modify grammar undo -> undone

conf/locale/locale_en-US.ini

@@ -159,7 +159,7 @@ unbind = Unbind
 unbind_success = Social account has been unbound.
 
 delete_account = Delete Your Account
-delete_prompt = The operation will delete your account permanently, and <strong>CANNOT</strong> be undo!
+delete_prompt = The operation will delete your account permanently, and <strong>CANNOT</strong> be undone!
 confirm_delete_account = Confirm Deletion
 
 [repo]
@@ -268,7 +268,7 @@ settings.update_settings = Update Settings
 settings.update_setting_success = Organization setting has been successfully updated.
 settings.delete = Delete Organization
 settings.delete_account = Delete This Organization
-settings.delete_prompt = The operation will delete this organization permanently, and <strong>CANNOT</strong> be undo!
+settings.delete_prompt = The operation will delete this organization permanently, and <strong>CANNOT</strong> be undone!
 settings.confirm_delete_account = Confirm Deletion
 
 members.public = Public