Allow dynamic language selection

[Pickysaurus]

Improvement

Currently

The available locales in the app are hard coded.

We want

A dynamic list of locales based on available resource files

Supporting Information

NexusMods.App/src/NexusMods.App.UI/Settings/LanguageSettings.cs

Lines 18 to 25 in a80cfb0

	// TODO: dynamically get allowed values
	CultureInfo[] supportedLanguages =
	[
	new CultureInfo("en"),
	new CultureInfo("pl"),
	new CultureInfo("de"),
	new CultureInfo("it"),
	];

Design

(Any designs to required for this feature)

[erri120]

So far the only solution I found is to literally try every language and see which one return a value. Not sure that's what we want, as it'll likely increase startup times by a lot. Maybe there's a cool source generator somewhat that just gives us a list of available languages at compile time....