Bug#1019550: cryptmount: [INTL:de] updated German po file translation

[R.Penney]

Thanks, Helge - that's very helpful.

I'll roll this into the next release of cryptmount.
Your changes should also be visible in the (new) GitHub repository at 
https://github.com/rwpenney/cryptmount/commit/e631e0d98238618c455f409292618f624ab80c3a