Pull missing `release/4.6` changes into `release/4.7`

As a result of the hiccup with some 4.6 changes continuing after we branched off to 4.7, there were some changes that didn't make it into 4.7. Some of these are duplicated with https://github.com/wordpress- mobile/WordPress-iOS/pull/2884 but unfortunately we need two PRs because `develop` has non stabilization changes in there that would sneak into the release branch.

Would you guys mind fixing the merge conflicts in these files? (Sorry for the double(although maybe technically triple) take @aerych)

* `WPPostViewController.m` - @diegoreymendez 
*  `CommentContentView.m` - @aerych 
* `ReaderCommentsViewController.m` - @aerych 
* `NotificationDetailsViewController.m` - @jleandroperez