Add support for multi languages

[Nielsvanpach]

No description provided.

[freekmurze]

Looks good!

[herpaderpaldent]

Thank you for this addition. This will help certainly!

However i have one question:

The current solution with language works via the 'magic' method but not if you would create the Country Object as you would do in the current README.

holidays/README.md

Lines 119 to 148 in faf22be

	## Adding a new country
	1. Create a new class in the `Countries` directory. It should extend the `Country` class.
	2. Add a test for the new country in the `tests` directory.
	3. Run the tests so a snapshot gets created.
	4. Verify the result in the newly created snapshot is correct.
	5. If the country has multiple languages, add a file in the `lang/` directory.
	In case your country has specific rules for calculating holidays,
	for example region specific holidays, you can pass this to the constructor of your country class.
	```php
	$holidays = Holidays::for(Austria::make(region: 'de-bw'))->get();
	```
	The value, `de-bw`, will be passed to the region parameter of the constructor of a country.
	```php
	class Austria extends Country
	{
	protected function __construct(
	protected ?string $region = null,
	) {
	}
	protected function allHolidays(int $year): array
	{
	// Here you can use $this->region (or other variables) to calculate holidays
	}
	```

This might be because

holidays/src/Countries/Country.php

Line 44 in faf22be

public static function make(): static

does not accept named parameters. Are you open to accept named parameter in that method and drop ...func_get_args() as well?

Or is the construction of holidays via the magic method the standard?

[Nielsvanpach]

I'm not sure I understand what you mean. Could you add a PR with a failing test?

I've included a test on how to use this with named params:
https://github.com/spatie/holidays/pull/177/files#diff-198ea683244cb0b1bcd6bc0093bf6a397a011ee9dcbbaca1e15917f6acbf54bcR96