patch 8.2.3961: error messages are spread out

Problem:    Error messages are spread out.
Solution:   Move more errors to errors.h.
diff --git a/src/vim9execute.c b/src/vim9execute.c
index fd53630..b92f5b9 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -6022,7 +6022,7 @@
 		      TFN_INT | TFN_QUIET | TFN_NO_AUTOLOAD, NULL, NULL, NULL);
     if (fname == NULL)
     {
-	semsg(_(e_invarg2), eap->arg);
+	semsg(_(e_invalid_argument_str), eap->arg);
 	return;
     }