Merge branch 'hotfix/fix_share_buttons' into develop

* hotfix/fix_share_buttons:
  Fix ajax
  add remove_lecture_from_favorites function
  add listener ajaxt
  fix share_buttons
  includes promo_codes in admin users
  add promocode view in admin
  attend if pay part
  remove sorting of lectures 2.0
  add favicon
  fix output lectures in users
  render lectures of welcome index
  fix side social icons
  add tagline logo
  add i will go button
  production_info
  add info if lectures is not
  fix user change password functional
  add to account ability of change password
  Update _themes.html.haml
fix button
Merge branch 'develop'

* develop:
  fix button