i18n: update spanish translations

Updated translations:

* adblock
* advanced-reboot
* aria2
* ddns
* firewall
* ocserv
* samba4
* schedule

Signed-off-by: Franco Castillo <castillofrancodamian@gmail.com>
Commit heading changed
Signed-off-by: Florian Eckert <fe@dev.tdt.de>