readme: Update German translation

[André Hentschel]

On 09.07.2013 20:52, Alexandre Julliard wrote:
> Julian Rüger <jr98 at gmx.net> writes:
> 
>> PS: I have some more manpage-patches in the works, but my spare time has
>> been a little scarce lately. Do you think 1.6 will be released Friday?
> 
> No, there will be an rc5 this Friday. There's a good chance that it will
> be the last rc though.
> 

Even if you don't make it in time for 1.6, there's still time to get it into e.g. 1.6.1