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GLPI is written in multiple languages and while it is still predominately PHP, the amount of JavaScript has increased a lot in recent versions and in 10.0 there will be the introduction of Twig. Currently, the developer documentation focuses solely on the PHP side.
This PR is a start of adding in documentation for the other languages by splitting the coding standards documentation into a Global Coding Standards page which includes global standards like line length, and individual pages for each language/file type (PHP, JavaScript, etc). It does not include standards for Twig yet since its use is not in the master branch yet.