skip ActionCable for follow/unfollow/block events, instead clear UI from
blocked account's posts instantly if block request succeeds. Add forgotten
i18n for sensitive content

This makes the UI appear less laggy. After all, the status *is* created
right there and then, it's the distribution to home timelines that can take
a while

Also fix reloading of timelines after merge-type events

entire timelines (only fetch since last known ID). Side effect: account
timelines no longer update in real-time

Also upgrade react-redux to latest version. This is a performance update

Track relationship in redux state. Display follow/unfollow and following-back
information on account view (unstyled)

This way replies will appear in the detailed view live if they are from
statuses that would be delivered to the user normally