* pgg-gpg.el (pgg-gpg-messages-locale): New user option.

* pgg-gpg.el (pgg-gpg-messages-locale): New user option.
(pgg-gpg-process-region): Set environment variable LC_ALL when
pgg-gpg-messages-locale is specified.
(pgg-scheme-verify-region): Don't copy messages from
pgg-errors-buffer to pgg-output-buffer.
(pgg-scheme-snarf-keys-region): Ditto.

* pgg-def.el (pgg-messages-locale): New user option.

* mime-pgp.el (mime-verify-application/pgp-signature): Copy
messages from pgg-errors-buffer.
(mime-add-application/pgp-keys): Ditto.