Misspelled German error message: --nosave (PR#7841)

Fixed, but bugs in translations should be sent to the translators listed 
in the appropriate file, here de.po.

Suggestion for adding to the R-FAQ.texi at the end of the R Bugs section:

Corrections to and comments on message translation should be sent to the
last translator (listed at the top of the appropriate @samp{.po} file) or
to the translation team as listed at
@url{http://developer.r-project.org/TranslationTeams.html}

[The reasons for the `comments on' is that most `corrections' so far are 
matters of style rather than fact.]