updated German translation

thanks Chris

see

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=743613

https://github.com/jcupitt/libvips/issues/116

Author: jcupitt

ChangeLog

@@ -3,6 +3,7 @@
 - vipsthumbnail --crop could fail for very non-square images, thanks
   Alessandro
 - fix a crash in vips_rawsave(), thanks Andrea
+- updated German translation, thanks Chris
 
 24/2/14 started 7.38.5
 - jpeg load from buffer could write to input, thanks Lovell