Commerce Discount forcing LANGUAGE_NONE

Hey there

At Koumbit it was discovered #2055815: Module not supporting multilanguage sites and searching through your code there is also plenty of uses of LANGUAGE_NONE. This could become problematic on multilanguage sites later on. It was a problem with fixed coupon until a patch was created so I wanted to bring it to your attention also.

Since we have a bunch of lines

classes/commerce_coupon.inc:      $entity->commerce_coupon_code[LANGUAGE_NONE][0]['value'] = commerce_coupon_generate_coupon_code();
commerce_coupon.install:    $value = array('line_item_id' => $line_item->line_item_id, 'coupon_id' => $line_item->commerce_coupon_reference[LANGUAGE_NONE][0]['value']);
commerce_coupon.install:    $line_item->commerce_coupon_reference[LANGUAGE_NONE][0]['coupon_id'] = $value['coupon_id'];
commerce_coupon.install:    $value = array('line_item_id' => $line_item->line_item_id, 'coupon_id' => $line_item->commerce_coupon_reference[LANGUAGE_NONE][0]['coupon_id']);
commerce_coupon.install:    $line_item->commerce_coupon_reference[LANGUAGE_NONE][0]['target_id'] = $value['coupon_id'];
commerce_coupon.install:      $order->commerce_coupon_order_reference[LANGUAGE_NONE][]['target_id'] = $log['coupon_id'];
commerce_coupon.module:  $coupon_code = $coupon->commerce_coupon_code[LANGUAGE_NONE][0]['value'];