fix show lectures after filtres
maybe fix share buttons
merge
Merge branch 'develop'

* develop:
  fix og:url
  remove ubiquitous
  maybe fix
  minor fix
  fix sharing buttons
  to staging
  add timeslot of 4.11 date
Merge branch 'master' of github.com:ulmic/nastachku

* 'master' of github.com:ulmic/nastachku:
Merge branch 'develop'

* develop:
  maybe fix share buttons
  fix show lectures after filtres