Changed '...' to real ellipse '…' in translations
Adde translation for 'Search for…' placeholder
Updated German translations
Updated German translations: Kitchensink => Showcase
Sorted German translations alphabetically
Added missing German translations for contenttypes
Added missing German translations for messages
Unconcatenated string inside __(…), otherwise it's not recognized
Changed "Installing Package" language string to "Installing package", as that one was already there
Corrected another  language string with linebreak
Some snmall corrections in german translation
Unified usage of English text to no space before an ellipse
Merge pull request #1818 from rarila/translations-de

Translations: Mainly German and some other small corrections