Sync translations

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

- fixes for #611 and #620
- adaptions for ddns-scripts 2.6.0
-- add hint for problems with BusyBox nslookup compiled with musl and offer installing hostip package
-- add hint for not installed certificates inside /etc/ssl/certs and offer installing ca-certificates package https://github.com/openwrt/packages/pull/2243
-- check if malfunctional BusyBox nslookup installed, so disable using option dns_server if not Bind host or hostip installed
- optimizations
- cleanup: remove .po files without any translations

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>

Sync translations.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

Sync translations to the current strings.

Changes in luci-app-ddns, luci-app-mjpg-streamer, luci-app-qos,
luci-app-shadowsocks-libev, luci-app-statistics and luci-base

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

 * Rename subdirectories to their repective OpenWrt package names
 * Make each LuCI module its own standalone package
 * Deploy a shared luci.mk which is used by each module Makefile

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

Some strings were hardcoded in English; make them translatable and add
them to the translation template.