Fixed PR #7

[Ascor8522]

Fixed conflicts in https://github.com/InternationalScratchWiki/scratch-wiki.info/pull/7

• re-added wiki logos
• re-moved css to dedicated file
• now using scss for easier maintainability
• refractored code
  • easier php logic
  • now using html flexbox instead of hard-coded table
  • support for test wiki languages
• added some translations
  • de
  • nl
  • it
  • removed unnecessary "test"
• added URL language parameter

Preview of new home page: Font might not look the same, I have custom fonts installed

On mobile: (yes, I know, the page might be a bit long, need to find a better design)

[GrahamSH-LLK]

You could probably shrink each box into a strip on mobile.

[Ascor8522]

Made some changes and it already looks much cleaner. Suggestions are always welcome.