Hi Matt,
Thank you for the additional clarification. In order to add the categories you would manually adjust the layout and add the expressions again, e.g.
<table>
<tbody>
<tr>
<td>
{$=Hello|en-US=Hallo|it-IT=Ciao$}</td>
</tr>
<tr>
<td>
$$label:TestFormCategoriesID$$</td>
<td>
$$input:TestFormCategoriesID$$</td>
<td>
$$validation:TestFormCategoriesID$$</td>
</tr>
<tr>
<td>
$$label:UserName$$</td>
<td>
$$input:UserName$$</td>
<td>
$$validation:UserName$$</td>
</tr>
</tbody>
</table>
Does that help? Let me know if you have any questions.
Regards,
Sandro