Product title translation in webform

I try to have a multilingual webform with the option to choose a product during registration. It works fine except translating the product title shown in the form. I tried two solutions not working for my form:

1) Module i18n: I can translate the corresponding string, but it isn't shown in the webform.
2) Internationalization for commerce product: Even with this module I can translate the product title, but it isn't shown in the webform.
(https://www.drupal.org/project/i18n_commerce_product)

Commerce: 7.x-1.14
Webform: 7.x-4.16
Commerce Webform: 7.x-2.0-beta2+2-dev

Any idea how to solve that?