luci-base: Update German translation
luci-base: Update German translation

The following changes are included:
* properly handle "Präfix" as neuter
* add missing hyphens to many appearances of "Präfix"
* fix spelling
* add few missing translations

Signed-off-by: Lars Kruse <21a6cafaf0e9b0080692d699c1538d0dfa42b47a@sumpfralle.de>

lbthomsen/openwrt-luci,Noltari/luci,openwrt/luci,hnyman/luci,rogerpueyo/luci,nmav/luci,Noltari/luci,hnyman/luci,artynet/luci,lbthomsen/openwrt-luci,hnyman/luci,rogerpueyo/luci,artynet/luci,lbthomsen/openwrt-luci,openwrt/luci,tobiaswaldvogel/luci,lbthomsen/openwrt-luci,nmav/luci,nmav/luci,artynet/luci,nmav/luci,Noltari/luci,openwrt/luci,Noltari/luci,nmav/luci,lbthomsen/openwrt-luci,lbthomsen/openwrt-luci,artynet/luci,artynet/luci,nmav/luci,Noltari/luci,openwrt/luci,rogerpueyo/luci,artynet/luci,rogerpueyo/luci,rogerpueyo/luci,openwrt/luci,nmav/luci,lbthomsen/openwrt-luci,nmav/luci,artynet/luci,rogerpueyo/luci,rogerpueyo/luci,artynet/luci,artynet/luci,nmav/luci,tobiaswaldvogel/luci,tobiaswaldvogel/luci,Noltari/luci,openwrt/luci,tobiaswaldvogel/luci,tobiaswaldvogel/luci,Noltari/luci,openwrt/luci,rogerpueyo/luci,tobiaswaldvogel/luci,hnyman/luci,Noltari/luci,lbthomsen/openwrt-luci,openwrt/luci,tobiaswaldvogel/luci,hnyman/luci,tobiaswaldvogel/luci,Noltari/luci,hnyman/luci,hnyman/luci,hnyman/luci