[Evolution] String change, "smileys" to "emoticons"

[Milan Crha <mcrha redhat com>]

        Hello,
as it had been pointed out in bug [761497], the Evolution should be
consistent and instead of using "smileys" and "emoticons", it should
use the later only. The fix for the bug had been committed [2]
for 3.19.91+ into the Evolution sources.
        Bye,
        Milan

[761497] https://bugzilla.gnome.org/show_bug.cgi?id=761497
[2] https://git.gnome.org/browse/evolution/commit/?id=975c49e