I think Akelos don't have a 'clean' way to do this. You can 'hack' Akelos a little bit this way:

Open lib/AkInflector.php
Find the pluralize method and add your spanish model names in the irregular array.

$irregular = array(
'person' => 'people',
'man' => 'men',
'child' => 'children',
'sex' => 'sexes',
'move' => 'moves',
'usuario' => 'usuarios',
'anacleto' => 'anacletos');

I hope it works for you! Luck!