Merge luxembourg-dev improvements into standard core
- Remove deprecated features: account/login system, scenarios, food module, offset/payment, estimation pages - Remove Italian language support and old backup files - Update core files: index.php (error reporting, bookmark include, scenario handlers) - Update _front_controller.php (remove deprecated routes, add extended page) - Update _content.php (remove offset link, remove scenario panel, remove estimation nav) - Add new files from luxembourg-dev: - _extended.php (informational pages) - includes/_functions_bookmark.php (enhanced bookmark handling) - language files for bookmarks and survey module (de_DE and en_GB) - Maintain full compatibility with client directories (jugend, waldorf-jugend-dev, xx_klima-arena-jugend)
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