Spanish translations

Fixed some translations.

Please, bring from arrays.xml:

<string-array name="cookiePreferences"><item>Accept all cookies</item>
<item>Only accept whitelisted cookies</item>
<item>Block all cookies</item>
</string-array>

In Spanish:

<string-array name="cookiePreferences"><item>Aceptar todas las cookies</item>
<item>Aceptar sólo las cookies de la lista blanca</item>
<item>Bloquear todas las cookies</item>
</string-array>