When we created the architecture for category tables, we added a category_translation table. We will alter this table and add a unique index to avoid duplicates for the same country code and category ID. Execute the following query:

ALTER TABLE  `learning_phalcon`.`category_translation` ADD UNIQUE (
`category_translation_category_id` ,
`category_translation_lang`
) COMMENT  '';

We will add a new array to the config/config.php global configuration file that will hold information about i18n:

'i18n' => [
  'locales' => [ //ISO 639-1: two-letter codes, one per language
    'en' => 'English'
  ]
]

<?php
namespace App\Core\Forms;

use Phalcon\Forms\Form;
use Phalcon\Forms\Element\Text;
use Phalcon\Forms\Element\Select;
use Phalcon\Forms\Element\Submit;
use Phalcon\Forms\Element\Hidden;
use Phalcon\Validation...