patch 8.1.0701: sign message not translated and inconsistent spacing

Problem:    Sign message not translated and inconsistent spacing.
Solution:   Add _() for translation.  Add a space. (Ken Takata)  Also use
            MSG_BUF_LEN instead of BUFSIZ.
diff --git a/src/version.c b/src/version.c
index 373f7a8..eb7b268 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    701,
+/**/
     700,
 /**/
     699,