Extension for Multisite Language Switcher plugin. All comments posted on translation-joined pages are displayed on all translation-joined posts.
You need to edit the comments.php in your theme folder if you want to store all the comments into one blog:
* activate the plugin first,
* find "comment_form" function call,
* add "global $mslsJoinedComments; switch_to_blog($mslsJoinedComments['primaryBlogId']);" just in front of it,
* add "restore_current_blog();" just below it,
* change the "comment_form();" to "comment_form(array(), $mslsJoinedComments['primaryBlogPostId']);".