Fixes:
- Service didn't start.
- GUI wasn't updated after refresh found new albums on manual refresh
- ProgressDialog wasn't shown when service was started before app (via
AlarmManager/Boot receiver)
Introduced plurals for notifications
Extended time of keeping the wake lock for service, as the service runs
in a separate thread.

Lock is release onDestroy()
Hopefully fixed the "A SQLiteConnection object for database was leaked!"
messages by explicitly closing the database onDestroy() of the main
activity.