luci-app-adblock: release 4.0.0

* complete rewrite, migrated to client side JS
* tested with mainline 19.07 and current master
* tested with latest Firefox & Chrome and all
  standard themes (not OpenWrt2020!)
  Pre-tested by many forum users, see here:
  https://forum.openwrt.org/t/adblock-4-pre-releases/57101
* sync translations

Signed-off-by: Dirk Brenken <dev@brenken.org>