Music: Update Greek translations

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: Ia10164d986d7d22b442409ba08d0af5520792d04
Let music player fade smoothly when playing/pausing/seeking

This patch implements a quick smooth fade effect when navigating
(seeking within a song, jumping to the next/previous song etc.)
and thus avoids hard clicks/noises.

Change-Id: I912ab143d2c45858cb2d2c0e756e530beee176fc