elfinder don't show image thumbnails in multilingual sites

I try to use elfinder inside ckeditor (wysiwyg module) in a multilingual site.
when I am in default language everything works fine, but when I go to my language http://example.com/fa/node/add/page and try elfinder I see filemanager without image thumbnails.
I find It's because elfinder get wrong filebrowserBrowseUrl parameter during initiation.

"filebrowserBrowseUrl": "/fa/elfinder?app=ckeditor"

and I think it's wrong and should be:

"filebrowserBrowseUrl": "/elfinder?app=ckeditor"

because elfinder uses this URI as its base url for display thumbnail.

I try this change on code and its seems it can solve problem. but I afraid use it in production unless someone expert approve it.

line 398 inside elfinder_wysiwyg_plugin function:

$language_default = variable_get('language_default', 'en');
$elfinder_url = url('elfinder', array('language'=>$language_default->language,'query' => array('app' => $editor )));