German translation

Please don't remove the source branch. Improvements of the improvements still follow.

• Add entry to _data/languages.yml
• Add entry to collections in _config.yml
• Add your language to the if else in _layouts/default.html
• Front Cover --debiankaios and reviewed by jjk1
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• Chapter 1 --reviewed by debiankaios
  • 1 - Getting Started --solars and Tuxilio
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  • 2 - Lua Scripting --Tuxilio
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    • renewed --debiankaios
• Chapter 2 --debiankaios and reviewed by jjk1
  • 3 - Nodes, Items and Crafting
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  • 4 - Node and Item Callbacks
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  • 5 - Creating Textures
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  • 6 - Node Drawtypes
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  • 7 - ItemStacks and Inventories
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• Chapter 3 --debiankaios and reviewed by Tuxilio
  • 8 - Basic Map Operations --2nd review by debiankaios
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  • 9 - Node Timers and ABMs
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  • 10 - Storage and Metadata
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  • 11 - Objects, Players, and Entities
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• Chapter 4 --debiankaios and reviewed by Tuxilio
  • 12 - Privileges
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  • 13 - Chat and Commands
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  • 14 - Player Physics
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  • 15 - GUIs (Formspecs)
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  • 16 - HUD
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• Chapter 5 --Tuxilio
  • 17 - Biomes and Decorations --reviewed by debiankaios
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  • 18 - Lua Voxel Manipulators --reviewed by Tuxilio(and a bit by debiankaios)
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• Chapter 6 --debiankaios and reviewed by Tuxilio
  • 19 - Creating Games
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• Chapter 7
  • 20 - Translation (i18n / l10n) --Tuxilio and reviewed by debiankaios
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  • 21 - Common Mistakes --Tuxilio and reviewed by debiankaios
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  • 22 - Automatic Error Checking --Tuxilio and reviewed by debiankaios
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  • 23 - Security --Tuxilio and reviewed by debiankaios
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  • 24 - Intro to Clean Architectures --Tuxilio and reviewed by debiankaios
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  • 25 - Automatic Unit Testing --Tuxilio
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  • 26 - Releasing a Mod --debiankaios and reviewed by Tuxilio(and a bit by debiankaios)
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  • 27 - Read More --debiankaios and reviewed by Tuxilio
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