Split & organise messages in to multiple files

[xrado]

I would be nice to have option to split lang file in multiple files. When you have multi app or large app you could organise messages in smaller files, which are easier to manage or reuse parts in multi app without duplicating translations for each app. I imagine syntax like this:

// en.json
{
	"key1": "Key 1",
	"key2": "Key 2",
	"validators": "@import('./validators.json')"
}

// validators.json
{
	"required": "Required",
	"invalid": "Invalid",
}

// end result (en.json)
{
	"key1": "Key 1",
	"key2": "Key 2",
	"validators": {
		"required": "Required",
		"invalid": "Invalid",
	}
}

what do you think?