Add support for Laravel's translator

I added a Smarty plugin to support Laravel’s translator. It's base syntax is inspired by smarty3-i18n:

    {t}messages.welcome{/t}

If the parameter `_count` is given, pluralization is used:

    {t _count="10"}messages.apples{/t}

All other parameters are passed to Laravel's translator as replacements:

    {t name="Dayle"}messages.welcome{/t}