patch 9.0.1594: some internal error messages are translated

Problem:    Some internal error messages are translated.
Solution:   Consistently do not translate internal error messages.
            (closes #12459)
diff --git a/src/gui_w32.c b/src/gui_w32.c
index 8e36f8d..162fe30 100644
--- a/src/gui_w32.c
+++ b/src/gui_w32.c
@@ -8535,7 +8535,7 @@
 
     if (mesg != NULL && mesgCB != NULL)
     {
-	iemsg(_(e_cannot_create_ballooneval_with_both_message_and_callback));
+	iemsg(e_cannot_create_ballooneval_with_both_message_and_callback);
 	return NULL;
     }