WOResourceManager, opposite of stringForKey

Hi guys,
I've been working on a new version of a website, with some parts that  
will be multilingual.
After reading about that, I decided to go the .strings way, with a  
localized .strings file (as the site isn't really dynamic).
It will be mostly DirectAction based.

So here's my question:
How can I access a key in my .strings file based on the value I got?
I mean, I know how to get the value from a key using  
WOResourceManager, but I'd like to ba able to request the opposite:  
the key based on (a localized) value.
That way I could make my DA more easier to maintain and a lot more  
smaller than explicitly write all the possible case in every language  
available.

I've red the WOResourceManager API, but without success.

Thanks for your help, have a nice sunday;)

Xavier