German language files

hi Yevhen ,

sorry for my bad english

I have taught the great plugin once the German language.

Here the modified backend.php and German .mo/.po file.
hier die zip für Yevhen den Plugin Author für das nächste update: Download

please drop feedback signal when if you’re doing it in the next update with insert.

mfg
seebaer1976

http://ww.wp.xz.cn/extend/plugins/js-css-script-optimizer/