translate to German

small fixes
updated translation
Merge branch 'master' of github.com:Morred/code-of-conduct into german-translation
Further improvements by @tobischo
display German language
English is the default language

* middleman picks the first language it finds, which before was
  only English by coincedence
Make language links locally - a bit afraid it's gonna blow up online

* we'll see, it SHOULD work
Polish wording fixes
Merge pull request #36 from chastell/polish_translation_fixes

Polish wording fixes