Add L10N comments to several unclear messages.

Updating Japanese translation, I found that some of the updated messages
were a little hard to understand without reading the code.

Add comments to some messages I nearly translated in a wrong way.

1 files changed, 4 insertions, 0 deletions

diff --git a/pgp.c b/pgp.c
index 776af84e..be182735 100644
--- a/pgp.c
+++ b/pgp.c
@@ -662,6 +662,10 @@ int pgp_application_pgp_handler (BODY *m, STATE *s)
 	  if (could_not_decrypt || (decrypt_okay_rc <= -3))
 	    mutt_error _("Could not decrypt PGP message");
 	  else if (decrypt_okay_rc < 0)
+            /* L10N: You will see this error message if (1) you are decrypting
+               (not encrypting) something and (2) it is a plaintext. So the
+               message does not mean "You failed to encrypt the message."
+            */
 	    mutt_error _("PGP message was not encrypted.");
 	  else
 	    mutt_message _("PGP message successfully decrypted.");