* adds optional short_name rendering for selectable codes
* refactors autocomplete field for compensation state into custom js tree widget
* adds single select (radio) alternative to tree widget templates
* introduces bootstrap class form-control for proper html form input rendering
* fixes bug where missing shared users for an entry resulted in a None exception
* adds GenerateInput with template in generate-content-input.html, which provides a generate button for fetching server-side content
* adds/updates translations