Complete german translation (#2240)
Complete german translation (#2240)

* complete german translation

* add missing period

Siedlerchr/jabref,bartsch-dev/jabref,tobiasdiez/jabref,shitikanth/jabref,Siedlerchr/jabref,grimes2/jabref,sauliusg/jabref,Mr-DLib/jabref,jhshinn/jabref,zellerdev/jabref,shitikanth/jabref,grimes2/jabref,JabRef/jabref,tobiasdiez/jabref,bartsch-dev/jabref,sauliusg/jabref,shitikanth/jabref,zellerdev/jabref,Mr-DLib/jabref,grimes2/jabref,oscargus/jabref,Siedlerchr/jabref,zellerdev/jabref,oscargus/jabref,Mr-DLib/jabref,mredaelli/jabref,sauliusg/jabref,bartsch-dev/jabref,mredaelli/jabref,jhshinn/jabref,zellerdev/jabref,Mr-DLib/jabref,Mr-DLib/jabref,zellerdev/jabref,tobiasdiez/jabref,JabRef/jabref,shitikanth/jabref,mredaelli/jabref,tobiasdiez/jabref,shitikanth/jabref,oscargus/jabref,grimes2/jabref,sauliusg/jabref,jhshinn/jabref,bartsch-dev/jabref,oscargus/jabref,Siedlerchr/jabref,grimes2/jabref,jhshinn/jabref,mredaelli/jabref,JabRef/jabref,JabRef/jabref,jhshinn/jabref,oscargus/jabref,bartsch-dev/jabref,mredaelli/jabref