patch 8.2.3970: error messages are spread out

Problem:    Error messages are spread out.
Solution:   Move more errors to errors.h.
diff --git a/src/clientserver.c b/src/clientserver.c
index 4ad17f4..2d234f2 100644
--- a/src/clientserver.c
+++ b/src/clientserver.c
@@ -119,7 +119,7 @@
 	{
 	    if (ret == NULL)
 	    {
-		char	*err = _(e_invexprmsg);
+		char	*err = _(e_invalid_expression_received);
 		size_t	len = STRLEN(cmd) + STRLEN(err) + 5;
 		char_u	*msg;