mysite 5.x-2.18

Fixes a number of small bugs.

-- #215095 by gustav. Fixes JavaScript failure on IE for mysite_links.
-- #219019. Feed include can produce an error if the admin is trying to add a feed.
-- Corrects an issue where users with the View permission but not the Edit permission are given the wrong error message.
-- Changes output message when no content exists. Message is now sensitive to who the user is. Requires translation updates.
-- #218777 by IceCeamYou. Enabling the MySite cache can cause an empty array to be passed if the user has no MySite page content.