ar_AR/all.js

That file shouldn't be loaded from your site. It's loaded from Facebook directly because they are constantly updating it for new features, bug fixes and other optimizations. It does have a cache time on it, though it's small (at like 15 minutes). That means it should only be loaded by users every 15 minutes or so. Additionally, since many sites have Facebook integration, it's likely that file may already be cached by your visitors when they come to your site.

I hope that answers your question, but if you need anything else, just let me know.

Thanks,
Alex