Updated German translations

"umdrehen" is perfectly fine for "flip".  

"kippen" would be translated to "to tilt" in my opinion. 


> Am 27.08.2014 um 22:10 schrieb Thorbjørn Lindeijer <notifications@github.com>:
> 
> In translations/tiled_de.ts:
> 
> >      </message>
> >      <message numerus="yes">
> >          <location filename="../src/tiled/flipmapobjects.cpp" line="+40"/>
> >          <location line="+4"/>
> >          <source>Flip %n Object(s)</source>
> > -        <translation type="unfinished">
> > -            <numerusform></numerusform>
> > -            <numerusform></numerusform>
> > +        <translation>
> > +            <numerusform>Objekt kippen</numerusform>
> > +            <numerusform>%n Objekte kippen</numerusform>
> I think "umdrehen" is possibly a better translation of "flip" than "kippen"? Or is "kippen" want GIMP / Inkscape call this action in German?
> 
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