DeskClock: Move the strings from AlarmClock Icon hiding

* Move the strings from strings.xml to cm_strings.xml
* Forward port DE translation from 10.2

Change-Id: I2b6f5b46ec61ccaccfdeb428e2ac1b5b38766736
DeskClock: Do not reduce method visibility

Change-Id: Ibc50c04f1a9b879ec76d1355f8203b7619964c77
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>