German laguage update

What has been done:

  - standardized expressions
  - shorter and clearer
  - minor corrections (orthography)
Docker mix and match setup

Rewrite of the docker setup. Now uses fig to manage containers and container
linkage. The base is a block based mix and match, which will give you the
possibility to easily test all configurations.
Merge pull request #409 from tstorch/translation-03

German laguage update
Merge pull request #410 from tstorch/docker_mix_match

Docker mix and match setup