ok, so this topic must match the slug of one of the Thunderbird topics. See https://support.mozilla.org/admin/products/topic/?product__id__exact=8

So they should be `learn-basics-get-started`, `download-install-and-migration`, `privacy-and-security-settings`, `customize-controls-options-and-add-ons`, `fix-slowness-crashing-error-messages-and-other-problems`. I don't see a topic created for Calendar so I guess we need to leave that out for now.