Hi!

It can be read from the DETAILS file of Gnupg the following :

,----
| Format of the "--status-fd" output
| ==================================
| Every line is prefixed with "[GNUPG:] ", followed by a keyword with
| the type of the status line and a some arguments depending on the
| type (maybe none)[...]
|         The username is the primary one encoded in UTF-8
`----

To be consistent with the rest of gpg(1)'s output, it would be good to
ask Gnupg to output everything in UTF-8 and treat the buffer as such.

Here's a proposal :