Added auto-revoke permissions warning (#214)

* Added auto-revoke permissions warning

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

* Shorten permissions revoke info text

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Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>
Co-authored-by: Sunik Kupfer <kupfer@bitfire.at>