Add the trait to the component and call the setupLocale method in onRun

<?php namespace Vendor\Plugin\Components;

use Cms\Classes\ComponentBase;
use Lunfel\OctoberCMS\Translation\TranslatableComponentTrait;

class MyComponent extends ComponentBase
{
    use TranslatableComponentTrait;

    public function componentDetails()
    {
        return [
            'name'        => '...',
            'description' => '...'
        ];
    }

    public function defineProperties()
    {
        return [];
    }

    public function onRun()
    {
        $this->setupLocale();
    }
}