Update keepassx_de.ts

improvable version of translationfile (english -> german)
You are right, it's quite challenging to find even the right English word here. 

For me "auto-type" is quite misleading, because it reads like "My computer suddenly starts typing something", which I don't want. Especially, not in terms of my passwords. It scares the user just by reading it. Therefore, the user is not even interested in what it actually does. 

If it's written "Direct-Fill" the user gets interested in finding out, what this feature actually does. That's another approach IMHO. Also later on, the user can easily associate "Direct-Fill" with what he actually sees KeePassX is doing. It's directly filling out the password form.