Croatian Language Update

Subscription manager and meny other improovments

* master:
  reduced constellation length
  fixed constellation pixel ratio
  fixed reversing arrow bug
  changed side-nav animation timing
  implemented delayed side-nav animation
  changed a-plus animation timing
  fixed side-nav icons alignment
  fixed flex-nav icons alignment
  changed flex-tab button ui
  Created and pushed by LingoHub. Project: 'Rocket.Chat' by User: 'gabriel.engel@gmail.com'.
  Created and pushed by LingoHub. Project: 'Rocket.Chat' by User: 'gabriel.engel@gmail.com'.

Conflicts:
	client/stylesheets/base.less

constellation is now retina-ready; added target-blank to the github
links.

* master:
  removing empty files crested by lingo hub
  Created and pushed by LingoHub. Project: 'Rocket.Chat' by User: 'gabriel.engel@gmail.com'.

* master:
  updated translations with Transifex
  Added translations

* master:
  formatting translations
  Created and pushed by LingoHub. Project: 'Rocket.Chat' by User: 'gabriel.engel@gmail.com'.

* master:
  Hebrew translation

Hebrew translation

Hebrew translation

* master:
  Update README.md
  Fix overflow-y mistake in wrapper
  Better Stylesheet organization + Fix for scroll in chatlist/messages

Better Stylesheet organization + Fix for scroll in chatlist/messages/userlist