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/scriptfile.c b/src/scriptfile.c
index c85263e..86ce100 100644
--- a/src/scriptfile.c
+++ b/src/scriptfile.c
@@ -359,7 +359,7 @@
 	char *basepath = path == p_rtp ? "runtimepath" : "packpath";
 
 	if (flags & DIP_ERR)
-	    semsg(_(e_dirnotf), basepath, name);
+	    semsg(_(e_directory_not_found_in_str_str), basepath, name);
 	else if (p_verbose > 0)
 	{
 	    verbose_enter();