D11554: Add warnings to why some actions might be invalid

[Méven Car]

meven added a reviewer: Frameworks.

REPOSITORY
  R283 KAuth

REVISION DETAIL
  https://phabricator.kde.org/D11554

To: carewolf, vkrause, #frameworks
Cc: kde-frameworks-devel, meven, LeGast00n, michaelh, ngraham, bruns
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