LB-1159: As an editor, I want to hide SMS posts

Fixed the view hidden toggle problem
LB-1219: Different button behavior for show hidden posts in sms and chain

Moved the new delete/undo delete in a new block and replaced the old
code, Nikola still needs to fix a bit of css
Merge branch 'cit-sms' of https://github.com/vladnicoara/Superdesk into cit-sms
Merge pull request #455 from vladnicoara/cit-sms

LB-1219: Different button behavior for show hidden posts in sms and chain