Beginning translation to German
/_layouts/base-de.html translated
this file needs some adjustment for further translation
- images still linked to /en/ as they should be move outside
  the lang-dependancy for all languages
- variables for download-version should be changed to download
  path instead as the downloads are not lang-specific

/de/* copyed and filenames translated refering to
/_layouts/base-de.html.
de:ueber.html (en:about.html) translated
- still needs adjustment for German linked pages