Index: uc_donation.module
===================================================================
--- uc_donation.module	(revision 1703)
+++ uc_donation.module	(working copy)
@@ -103,7 +103,7 @@
         '#field_prefix' => variable_get('uc_sign_after_amount', FALSE) ? '' : variable_get('uc_currency_sign', '$'),
         '#field_suffix' => variable_get('uc_sign_after_amount', FALSE) ? variable_get('uc_currency_sign', '$') : ''
       );
-      $form['submit']['#value'] = variable_get('add_to_cart_text_donation', 'Add to cart');
+      $form['submit']['#value'] = t(variable_get('add_to_cart_text_donation', 'Add to cart'));
       $form['submit']['#weight'] = 10;
       $form['#validate'][] = 'uc_donation_add_to_cart_form_validate';
     }