patch 8.2.3983: error messages are spread out

Problem:    Error messages are spread out.
Solution:   Move more error messages to errors.h.
diff --git a/src/hardcopy.c b/src/hardcopy.c
index 9a7e7c6..3993f4d 100644
--- a/src/hardcopy.c
+++ b/src/hardcopy.c
@@ -2641,7 +2641,7 @@
     }
     if (prt_ps_fd == NULL)
     {
-	emsg(_("E324: Can't open PostScript output file"));
+	emsg(_(e_cant_open_postscript_output_file));
 	mch_print_cleanup();
 	return FAIL;
     }