Added support for L10n on themes {__('Translate this!')}.

classes/themes.class.php

 		preg_match_all($patron,$this->output,$out);
 
 		foreach($out[1] as $k=>$v){
-				$this->output = str_replace("{__('$v')}",$this->l10n->__($v),$this->output);
+				$this->output = preg_replace("/{__\((?:'|\")$v(?:'|\")\)}/",__($v),$this->output);
 			}
 	}
 }