improve german translation according to #312
improve german translation according to #312

CGA1123/helpy,helpyio/helpy,monami-ya/helpy,Rynaro/helpy,scott/helpy,monami-ya/helpy,CGA1123/helpy,scott/helpy,helpyio/helpy,CGA1123/helpy,CGA1123/helpy,scott/helpy__helpdesk_knowledgebase,Rynaro/helpy,Rynaro/helpy,monami-ya/helpy,scott/helpy__helpdesk_knowledgebase,helpyio/helpy,helpyio/helpy,scott/helpy,scott/helpy__helpdesk_knowledgebase