Multilanguage problem in checkout display

- The error occurs only on multilanguage sites after a language switch.
- The error occurs for anonymous visitors and logged-in users.

See the screenshot after a switch from English to German. The page is correct in German, but the checkout progress content is in English.
The same occurs after a switch from German to English.

Screenshot

Cause of the error

The problem is the cache use with the function commerce_checkout_progress_get_items($refresh = FALSE).

This function is called in the function commerce_checkout_progress_block_view() to display the checkout progress content.

    if ($visible) {
      // Get non-empty pages.
      $pages = commerce_checkout_progress_get_items();
      $content = array(
        '#theme' => 'commerce_checkout_progress_list',
        '#items' => $pages,
        '#type' => variable_get('commerce_checkout_progress_list_type', 'ol'),
        '#current_page' => $page_id,
        '#link' => variable_get('commerce_checkout_progress_link', TRUE),
      );
      return array(
        'subject' => '',
        'content' => $content,
      );
    }

A simple use of the $refresh parameter with the value TRUE

      // Get non-empty pages.
      $pages = commerce_checkout_progress_get_items(TRUE);

solves the problem. The progress content are correct displayed after language switches.

With this scenario is the implemented cache function meaningless.