Avoid misleading status message after decrypt and/or verify

In combination with the verification of signatures the word "Successfully"
could give the wrong impression that everything is okay. The word only
referred to the technical operation of decryption and/or verification,
but not to the actual result of the signature verification. Even if the
signature didn't match the data (which is clearly communicated after the
first line of the status message) the first line started with
"Successfully".

(cherry picked from commit b6991f9f505cb3755c71f0082f0daf33ec01802c)

• GnuPG-bug-id: T8273