patch 8.2.4003: error messages are spread out

Problem:    Error messages are spread out.
Solution:   Move more error messages to errors.h.
diff --git a/src/menu.c b/src/menu.c
index d77fbc9..88b8b84 100644
--- a/src/menu.c
+++ b/src/menu.c
@@ -530,7 +530,7 @@
 		if (*next_name == NUL && menu->children != NULL)
 		{
 		    if (!sys_menu)
-			emsg(_(e_menu_path_must_not_loead_to_sub_menu));
+			emsg(_(e_menu_path_must_not_lead_to_sub_menu));
 		    goto erret;
 		}
 		if (*next_name != NUL && menu->children == NULL