patch 8.2.1460: error messages are spread out

Problem:    Error messages are spread out.
Solution:   Move more messages into errors.h.
diff --git a/src/match.c b/src/match.c
index 2bb98fe..0df7bfe 100644
--- a/src/match.c
+++ b/src/match.c
@@ -1296,7 +1296,7 @@
 	id = eap->line2;
     else
     {
-	emsg(_(e_invcmd));
+	emsg(_(e_invalid_command));
 	return;
     }