[Solved] How do locales work? How do I clear cache? How do I delete files? Where is the any key?*

I went ahead and copied the locale/en-CA.php file, renamed it es-ES.php, and modified it as follows:

<?php

// Date: Sat, 29 Jan 2011 16:51:08 +0300

$Definition['UserInfoModule.Thanked'] = 'Agradeció a';

$Definition['Profile.Tab.Thanked'] = 'Agradeció a';

$Definition['Thanked by'] = 'Agradecimientos por';

$Definition['Thanked by %1$s'] = 'Agradecimientos por %1$s';

$Definition['ThankCommentOption'] = 'Agradecer';

$Definition['ExpandThankList'] = 'Expandir';

$Definition['CollapseThankList'] = 'Colapsar';

$Definition['UnThankCommentOption'] = 'Quitar agradecimiento';

What do I have to do in order for this to work? Thanks!