symfony-sync-translations
Synchronize translation catalogs across maintained Symfony branches: find messages that newer branches added to the English catalogs but that are still missing from the oldest maintained branch, then add them (with a translation per locale) on that oldest branch so they cascade up via merges. Use when the user says "synchronize translations", "sync new translations", "sync the translation catalogs", "add the missing translation messages", or "propagate new xlf messages".