Specify language of Comment using Entity Translation? I'm building a site with multilingual support using Entity Translation. It is allowing authors to specify a language when creating a node, but there's no way to specify language when commenting on a node.

In Configuration > Entity translation, the Comment item is checked in the Translatable Entity Types section.

In Structure > Content Types > Post, I see tabs for Comment Fields, and Comment Display, but language is not one of the options.

I have been looking into the form_comment_form_alter hook, but so far have had no success with that.

In the Permissions panel, I confirmed that Administrator has "Translate entities of type Comment" checked. Even when editing a comment as admin, there is no option to translate.

The site uses Organic Groups 7.x-2.5, if that could influence this problem. The OG Post content type is the main one I'm trying to get fully functional.
Drupal natural way would be to show comments for different languages separately.

For example If you have a node in English and Spanish. Drupal natural way would be to show comments for en/es translation separately (attached to en/es content). 

If you are looking for language field you can use Language field module...


  This module creates a Language Field that combines Drupal 7's Field
  list options and Internal language list.
  
  This is used to simply collect language data.