refactor(i18n): simpler fallback system

[ematipico]

Changes

This PR makes the fallback system way simpler. The initial configuration had the idea where a user could define the order of the fallbacks. In the below example, pt_BR will fallback to pt and if pt doesn't have a translation, it will fallback to en.

const i18n = {
	fallback: {
		pt_BR: ['pt', 'en']
	}
}

Nuxt inspired this, although in their latest version, they removed this configuration. Also, other vendors have a simple system.

Also, this complex fallback system would only work if we create a middleware function for each member in the array, and this is overkill.

The new configuration is like this instead:

const i18n = {
	fallback: {
		pt_BR: 'pt'
	}
}

Testing

I updated the test with more test cases.

Docs

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