Update keepassx_de.ts

improvable version of translationfile (english -> german)
Well, maybe a more meaningful wording like "Direct-Paste", "Auto-Fill", "Direct-Fill" or "Auto-Form-Paste" would describe the feature better?! Initially I thought "Auto-Type" is something odd. I would translate it's functionally then to "Automatisches Formularausfüllen aktivieren". While this is quite long "Direktausfüllen aktivieren" might be better.