Add famfamfam flag icons

source: http://www.famfamfam.com/lab/icons/flags/
Add language icon from thenounproject

source: http://thenounproject.com/term/translation/987/
prepare language menu
Prepare i18n for the menu
add hyde plugin for string splitting in jinja
Prepare language selection by file extension
prepare contact page for multi-language
support english in sidebar
introduce new language plugin
generate output in each language

Having pages in each language means, that we don't loose the
selected language state.
keep i18n links working
enable language chooser
Translate Status Widget
fix for checking files with .de suffix