Bean doesn't pass the language code to field_attach_form_validate()

Bean invokes field_attach_form_validate() to validate its fields, but doesn't pass the language code to it. This doesn't cause any problems on mono-lingual sites.

But on multi-lingual sites it causes the field module to validate all language versions of the field (when using field translation). And that can in some cases cause the following error if the values from other languages fail validation:

Error message
Notice: Undefined index: array_parents in field_default_form_errors() (line 394 of /data/xxxx/www/modules/field/field.form.inc).
Recoverable fatal error: Argument 2 passed to drupal_array_get_nested_value() must be an array, null given, called in /data/xxxx/www/modules/field/field.form.inc on line 394 and defined in drupal_array_get_nested_value() (line 6787 of /data/xxxx/www/includes/common.inc).

I found that it doesn't happen with all types of fields. But I had the issue with Link module.

So here's how to replicate:
1- Create a Bean type with a Link field (using the Link module) with field translation enabled.
2- Create a Bean with a valid value in the Link field (linking to a node).
3- Create a translation of that bean in another language on the site (let's say now we have English - the default language of the site- and French).
4- Delete the node (which would make the URLs invalid in both the English and French version)
5- Now got an edit the French version. Any attempt to save will result in the error above.

Passing the $langcode to the function fixes it all. (patch to follow in a comment).