I was a little puzzled by this changeset in Thunderbird trunk:
http://hg.mozilla.org/comm-central/rev/b9ce47b3670b
If I understand correctly, the new "smart reply" button is dummy and is
only used when customizing the toolbars. It is well commented in the XUL
file, but I think it also deserves a localization note.
http://hg.mozilla.org/comm-central/rev/b9ce47b3670b#l2.13
Regards,
--
Benoit
FrenchMozilla l10n team