Refs: #3478@2h Access correct referential in line_footnotes Ctrl

  + ApplicationController provides Pundit's UserContext's referential with `@referential` instead of `current_referential`,
    (`@referential` is computed from the URL,  while `current_referential` was aliased to different methods, **not always**
     pointing to `Referential` instances)

  + ApplicationPolicy uses the record's referential in its `referential method` iff it is an instance of `Referential` else
    it uses the abovely provided referential, locally named `@current_referential` (as it should be named in the Ctrl too)
    This assures, in combination with the Ctrl Change, that `referential` **always** returns an instance of `Referential`!

  - TODO: Review my understanding of _Referential Setup_ inside the Ctrls

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