Merge branch '7.4' into 8.1

* 7.4:
  [Validator] Drop unreachable territory keys from IBAN formats
  [FrameworkBundle] Fix the "framework.remote-event" config node being impossible to set
  [Security] Read the "active" member of an introspection response as a boolean
  [Validator] Add missing Arabic translation for validation units
  [Security] Answer 401 instead of 500 when the introspection request fails