DeskClock: Fix german translation of "days"

* Currently the snackbar says
  "Der Wecker klingelt in 5 Tage, 3 Stunden  und 47 Minuten"
* It must be "Der Wecker klingelt in 5 Tagen, 3 Stunden und 47 Minuten"
* Also checked if these plurals aren't used elsewhere so other strings
  wouldn't make sense anymore - no more usages found

Change-Id: Iabadaa254afc7a04cb00d79753be1443719fce2c
1 file changed