[VoiceOver] Reader: Post Detail View concerns

This is for the page accessed when navigating to a post from Followed Sites → Tap on a post.

<img width="320" alt="iPhone Xs — 12 2 2019-11-05 13-11-04" src="https://user-images.githubusercontent.com/198826/68242439-c03b4880-ffcd-11e9-9c68-d95303e302ac.png">

A: “Attachment. PNG. File” is dictated first.

Open a post and the text “Attachment. PNG. File” will be dictated. My guess is that this is the featured image. The problem is this is still dictated even if there is no featured image.

• [x] Fixed in #12903

~B: The header cannot be navigated to when swiping~

~Please see this video~

• [x] Extracted to #12904

C: The More button in the header is not accessible

But even without VoiceOver, it looks like it cannot be tapped anyway.

• [x] Seems to be working fine

D: The Like button has no hint and does not have .button trait if selected

Unlike our other Like buttons, the Like button on this page does not say “Remove from likes” or an equivalent. It also does not say “Button” if it is selected.

• [ ] Pending