[arch-general] Translation not fully working with gnome and gdm

Hello everyone, i have a problem with my arch linux system running with gnome and gdm. In some applications, or on the right click menue all entries are not translatet. So, normaly i have configured my system in german. In most of applications and menues there still working fine. But some cases i have no translation yet :-( What is the problem? Is there a problem with any dependencies? Thanks for help