improved translation & added german translation

intend
Merge pull request #38 from ivoba/upstream

Improved translation and added German translation.
Added missing (empty) _config.php, SS3 now correctly detects module (i.e. for translations).
Improved translation, use translation for templates (SS3-style).
Improved German translation (typos, bad style)

(Spelled "E-Mail" according to the Duden dictionary: http://www.duden.de/rechtschreibung/E_Mail )
Merge pull request #40 from benediktb/fix-missingconfig

Added missing (empty) _config.php, SS3 now correctly detects module (i.e. for translations).
Merge pull request #41 from benediktb/german-translation

Improved german translation
Rename the Packagist package and add screenshots
Fix Composer installation path
merge upstream
merge upstream
member approval translation