FAchievementSort: fix parsing US date formats

[candela97]

Test the format before getting date formats if language is English. I'm starting to wonder if there're other unstable locales 😥. Fixes #1908.

[tfedor]

I wonder if we can just ignore languages completely, just make a large list of known date formats, and iterate that one, until we hit the format that can be parsed - you basically already do something like this, but in a more convoluted way.

It should simplify all these language shenanigans, since we see they're also not reliable.

[candela97]

Yeah regexes will be more flexible, but luxons format is straightforward and handy 😥. Or maybe just load the page in a locale that's stable and easy to parse? SteamDB uses finnish https://steamdb.info/blog/extension-achievements-update/

[tfedor]

Can't we just send string with a luxon format to luxon, and see if it throws or not? It should be throwing exception if it fails to parse, right?

If not, we can do what SteamDb does, we already have a solution to load the page in English, we could've been smarter and do some other language like they do 🤷

[candela97]

We can go with Czech I suppose 😂. But that means we'll need to remove English formats because it's unstable...

[tfedor]

That's fine with me, it would simplify it at least. Shame we need to do extra request though.