Unable to activate translation

Hi everybody,

I am trying to do a translation in to German for the forums plugin. I am using the CodeStyling Localization Plugin for it.

Unfortunately what ever I name the the .po .mo files (de_DE.mo, forums-de_DE.mo, wpmudev_forums-de_DE.mo) or wherever I place (Main plugin folder or under languages), there is no result?!

Is there anyone to the who can give me a hint what I am doing wrong?

Thanks & Bests
Thorsten