Is there a translation of at least the New Testament into German which uses modern vocabulary and idioms, similarly to the way The Message does in English?
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There is a contemporary translation of The Bible done by the "Gute Nachricht" project. The translation is available as print or online (free). At the online portal you will also find various other translations including Luther's.
I don't know if that is what you are looking for, but there is a project called volxbibel, which is a translation done in form of a wiki under the creative commons license. Which is an interesting idea.
The language is very atypical to a bible and quite modern.
AFAIK the whole thing is controversial, because the language may not be accurate in some places or is regarded to be inappropriate for a bible.