* implementation of the login widget
Merge branch 'develop' into feature/login-widget

* develop:
  login page pull request review
  pull request review
  added controls for the video widget by default
pull request review

+ changelog entry
+ removed custom locales, reusing the login_page locales
+ using simple_form_for to create the login form
+ auto generate widget thumbnail
+ added cell action "reset_password" to reuse in show and form action
+ clean up login widget cell
+ add dependency warning to USAGE file
Merge branch 'feature/login-widget' into develop

* feature/login-widget:
  pull request review
  * implementation of the login widget