add alert when full site in promotion

lang/en/lang_functions.php

@@ -327,6 +327,8 @@ $lang_functions = array
     'menu_claim' => 'Claim: ',
     'text_complains' => 'There %s %u pending complaint%s.',
     'text_contactstaff' => 'Contact staff',
+    'full_site_promotion_in_effect' => 'Full site [%s] in effect!',
+
 );
 
 ?>