adds file for german translation
translates chapter "introduction"
translates toc and chapter headings
translates chapter "directory structure"
translates chapter "optimize the digest cycle"
translates chapter "others"
Merge branch 'master' into german_translation
translates chapter "modules"
Merge branch 'master' into german_translation
synchronizes de with en
Merge branch 'master' into german_translation
synchronize de with en
Merge branch 'master' into german_translation
sync
cleanup
translates section about contributions
translates section about routing
translates section about templates
translate section about controllers
translate section about directives