There is a dialog where the user is asked to enter a passphrase.  The German
translation of this dialog could be improved:

In general, I'm not that sure whether we should "Passphrase" with "Passwort". 
Maybe, it is better to translate it literally as "Passphrase" or use something
like "Kennsatz" to make sure that this is not the regular Unix password.

We should take a decision whether we want to translate "mount" and "unmount".  I
vote to use "einhängen" and "abhängen".  If we keep "mount" unchanged I's prefer
"mounten unter" and not "mounten auf".  But maybe, that's just my personal
idiosyncrasy ;)

In the window title, also say "_das_ Passwort".

Button texts in the help text (Abbrechen) and as the button label (Verwerfen) do
not match.

Instead of "keine Systemdatei" better use the plural form ("keine Systemdateien").

See attachment.  In part, German issues were already reported as bug 104591 by
Christian Boltz.