patch 8.2.3967: error messages are spread out

Problem:    Error messages are spread out.
Solution:   Move more errors to errors.h.
diff --git a/src/if_xcmdsrv.c b/src/if_xcmdsrv.c
index c814f21..763eee5 100644
--- a/src/if_xcmdsrv.c
+++ b/src/if_xcmdsrv.c
@@ -425,7 +425,7 @@
     if (w == None)
     {
 	if (!silent)
-	    semsg(_(e_noserver), name);
+	    semsg(_(e_no_registered_server_named_str), name);
 	return -1;
     }
     else if (loosename != NULL)