Translation of unsubscription process and Communication Preferences Page
How to translate the unsubscription page.
To do that, go to Settings → Categories → Customize Communication Preferences and Unsubscribe pages.
You will see all of the translatable snippets grouped into pages.
Note that you want to keep unchanged the dynamic merge tag {{categoryName}} (or any other merge tags). This will populate with dynamic information, for example, the name of the category that the person is unsubscribing from.
To preview the translated page, click on the "View page" link.