added new folder structure for translations in en and de. Also added switch logic to build
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages
added string translations in config and made en/de folders for menues obsolete
deleted unused files
added some german translations to menu
added header to translation files
added cheat sheet to footer
review of en content
added de folder with updated content from en. added locales=de
added language switch in footer with translations and in all root/index files
reviewed the structure, added chicken to landing page, added call for action. excluded the links to the  de section
fix link to contributors

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move appconfig plugin down, as it is less important

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s/plugin-tutorial/tutorial

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simplify intro

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typos

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