patch 9.0.1523: some error messages are not marked for translation

Problem:    Some error messages are not marked for translation.
Solution:   Surround the messages in _(). (closes #12356)
diff --git a/src/version.c b/src/version.c
index b24277d..1197ada 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1523,
+/**/
     1522,
 /**/
     1521,