crossword preview for ReviewController
delete crossword functionality
avoid the passive form in user strings and translation update
three corrections:
- ask for user authentication in posts if someone is logged in,
  but has no editor rights in the current project
- let name="" in the shortcode on a build page show a default
  empty crossword on page load, but load namesList anyway
- filter out deleted users or with their capability revoked but
  still in an editors list