https://gitlab.com/enigmail/enigmail/commit/f196a31a9e56b8a0bd7b4ebe9af08f6e78d78e2d

From 94fb482e3463e756d76f9309cdc2fb7560822eb0 Mon Sep 17 00:00:00 2001
From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
Date: Mon, 21 May 2018 15:55:03 -0400
Subject: [PATCH] Use correct mdcError string

Without this change, the build process fails with:

MISSING PROPERTY: missingMdcError
---
 package/errorHandling.jsm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/errorHandling.jsm b/package/errorHandling.jsm
index 8173fa72..bc8bdcb3 100644
--- a/package/errorHandling.jsm
+++ b/package/errorHandling.jsm
@@ -309,7 +309,7 @@ function decryptionInfo(c) {
       c.statusFlags |= EnigmailConstants.DECRYPTION_FAILED; // be sure to fail
       c.flag = EnigmailConstants.MISSING_MDC;
       EnigmailLog.DEBUG("errorHandling.jsm: missing MDC!\n");
-      c.retStatusObj.statusMsg += EnigmailLocale.getString("missingMdcError") + "\n";
+      c.retStatusObj.statusMsg += EnigmailLocale.getString("mdcError") + "\n";
     }
   }
 }
-- 
2.16.3