[ESD-translators] Updating the ESD in light of EFAIL

[Molly de Blanc]

Hi!

After some problems were discovered with enigmail and GPG, we updated
the Guide. They are fairly minor updates with big implications.

Step 1.B: Added

"Enigmail versions prior to 2.0.6 have serious security issues. Make
sure to install version 2.0.6 or later. The current version is 2.0.6.1."

Important: Security tips: Added

"For greater security against potential attacks, you can turn off HTML.
Instead, you can render the message body as plain text. In order to do
this in Thunderbird, go to View > Message Body As > Plain Text."

Please feel free to update translations at your convenience.

Thank you!

Cheers,
Molly

-- 
---
Molly de Blanc
Campaigns Manager
Free Software Foundation
617-702-4647
she/her/hers