i18n shell validation msgs not being extracted

I'm trying to generate the pot files from my site with cake's i18n shell useing cake 2.3. As mentioned in the cake docs the shell should automatically extract the validation msgs. However, none of the validation strings are added to my pot files. 

My validation array simply looks like: 

public $validate = array(             

'currency' => array(

'notempty' => array(

'rule' => array('notempty'),

'message' => 'Select a currency'

),

),

'title' => array(

'notempty' => array(

'rule' => array('notempty'),

'message' => 'Fill out a title'

),

)

... etc

)

What am i not seeing here?!

Thanks allot!

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