If it is not possible to design the two languages on the same document, you can design them separately but you need to ensure that the standard and format is the same in both languages,
Os nad yw’n bosib dylunio’r ddwy iaith ar yr un ddogfen, gallwch eu dylunio ar wahân ond bydd yn rhaid sicrhau bod y diwyg a’r safon yr un yn y ddwy iaith,