I've altered a form where I set the save button text to
But how can I make sure that I can translate this string in admin/config/region/translate/translate ?
I've tried to add this
$conf['locale_custom_strings_en'][''] = array( 'Buy Product' => 'Koop Product', );
to my settings.php but no result. How can I make sure the string in my code can be translated in drupal itself?