WordPress plugin providing multilingual support via Multisite - connects content across sites for language switching.

• MultisiteLanguageSwitcher.php - Plugin bootstrap (do not modify header)
• includes/ - Core PHP classes (lloc\Msls\ namespace)
• src/ - JavaScript source components
• assets/ - CSS, JS, flags, images
• tests/ - PHPUnit + Playwright tests
• vendor/ - Composer dependencies (do not edit)

• WordPress Coding Standards (PHPCS)
• Strict typing (declare(strict_types=1))
• Text domain: msls

PHPStan (strict) | PHPCS | PHPUnit | Playwright | GitHub Actions on PRs

• Edit vendor/ or build/ directories
• Modify language files outside localization workflow
• Change plugin header in MultisiteLanguageSwitcher.php