Hi,

The description field is probably hidden in Screen Options in the right top corner or the menus page. You just need to activate it and add your HTML Blocks shortcode.

HOT label text can be edited with PO file translations as any other theme or plugin texts. Here is a video that demonstrates how to translate strings with Loco Translate plugin https://www.youtube.com/watch?v=tAFq1yTfWfU

Regards