Added some missing localised strings
Prevented 'Read' and 'Typing' indicators from functioning on Message Requests
Prevented link previews on the first message of a message request
Added a confirmation alert when trying to clear all message requests
Added a confirmation alert when trying to delete a message request
Added an empty state to the MessageRequestsViewController
Updated the back behaviour of the ConversationVC to behave more nicely with approving/declining message requests
Updated the OWSBlockingManager to also update the stored contacts 'isBlocked' flag to match