Change t('Appears in: @bundles') to t('Appears in: @bundles.')

The code t('Appears in: @bundles', ...) appears twice in the Drupal Commerce module: commerce_customer.module and commerce_product_reference.views.inc. This translatable text is almost equal to the text that is used in the Views module, only in the Views module there is an additional period. I suggest to add this period too in the Commerce module such that translations can be reused. The actual text is used in the same place as where it is used in the Views module.