[Phpug] l10n and i18n

[Deathmaster]

Hello there

I was wondering if any of you guys have a good suggestion when it comes to 
localization of a php application

my boss threw the challenge at me (translating a whole app in a foreign 
language), and i thought it would be much better to find a scalable approach 
to the problem, rather than creating a classic  /app/en, /app/de, /app/it 
etc. structure

The whole problem really boils down to the translation of button, labels and 
js  messages
I considered using xml files, or constructing arrays to manage the 
translation, but before I dive into it, I thought i'd better ask the almighty 
PHPUG

I'm sure someone else had this painful problem to solve before, so i'm hoping 
you come up with something interesting, to my eternal gratitude

thanks
Joe