[PHP-I18N] Problems passing variables to gettext

Hello, I have a problem using gettext in php that I can't solve, I've been
through the different posts, and can't get it. 

I have a file of string variables for a site, like address, phone, etc, of
which one of them has to be translated. 
So I put in the variables.php file
$sitetitle= _('My beautiful site') ; 

Translated it in the po files (through PO edit)

Now in my index page, I set the locales, and call my variables. 
And I can't get $sitetitle to be translated, it still stays in the original
language (which means the variable is recognized, but not translated)

the echo _($sitetitle) does not work. 

Any idea ? 
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