use 'persistent' cookie for 'graphic content' blurring (rather than session cookie) #4189
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Turns out that Angular's
$cookies
library defaults to session cookies (which I didn't spot, since the extension I was using to view the cookies whilst developing showed an expiry time).This PR adds an
expires
property to the cookie when setting it (set to today plus 399 days - the max expiry enforced by some browsers) and if the cookie exists it resets it every page load to effectively extend the expiry indefinitely (that also cleans-up/replaces the old 'session' cookies).