feature/505+483: create recorder popup

* create a block for logged in users to show a record button on all pages except the recorder form
* create a 2-step popup to show when the button is clicked (template, css, js)
  1) enter URL the record
  2) enter information for saving
* rename the label and options of severity to form a sentence
* error messages for filling the form + warning messages about being in alpha... (feature/483)
* saving will redirect to the created node, as the original form
* deleting, and starting a new will reload the page and automatically show the popup prefilled with the default URL
Lets have this default value in a constant.