feat: Support for localized strings

[dimtrovich]

Introduction of translation support.
Until now, all the texts generated by the CLI have been in English. The problem is that some people run commands in other languages (French in my case) and so you get a mixture of English and French, which isn't very cool to see.

This subject has already been discussed here #64

With this PR, the texts are translated and the developer can therefore use the language best suited to his project

// example

<?php

use Ahc\Cli\Application;
use Ahc\Cli\Translations\Translator;

include './vendor/autoload.php';

Translator::$locale = 'ru';  // en, fr, es, de, ru 
$app = new Application('My Application');

$app->command('rmdir');

$app->handle($_SERVER['argv']);

en (default)

fr - French

es - Spanish

de - German

ru - Russian