I18n: Fix last remaining user-visible mention of the abbreviation "SX".

This should have never appeared in a user message. However, in order
not to make this single string untranslated, we add the correct form
but don't use it yet so that it can be translated, and we will be
using it once 2.4.0 is out and the string freeze lifted.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@19506 57a11ea4-9604-0410-9ed3-97b8803252fd

src/gnome/dialog-sx-editor.c

@@ -214,8 +214,15 @@ sxed_confirmed_cancel(GncSxEditorDialog *sxed)
     if ( gnc_sxed_check_changed( sxed ) )
     {
         const char *sx_changed_msg =
+#if 1
             _( "This SX has changed; are you "
                "sure you want to cancel?" );
+#else
+        /* Translators: This message is currently not yet used; it
+         * will be used once the 2.4.0 string freeze is lifted. */
+            _( "This Scheduled Transaction has changed; are you "
+               "sure you want to cancel?" );
+#endif
         if (!gnc_verify_dialog(sxed->dialog, FALSE, "%s", sx_changed_msg))
         {
             return FALSE;