CodingFabian

Because WPML creates posts and pages for each language, comments from one do not appear on the other. 
This plugin merges comments from all WPML translations of the posts and pages, so that they all are displayed on each other. 
Comments are internally still attached to the post or page they were made on.
It uses the <code>get_comments()</code> api call, which in some circumstances might not return all posts.

WPML comment merging

This plugin merges comments from all WPML translations of the posts and pages, so that they all are displayed on each other.

weDevs

alamgircsebd

Sabbir Ahmed

Dokan, Inc.

Rafsun Chowdhury

Dokan Multivendor is based on the famous eCommerce solution WooCommerce. To enable multiple language feature WPML is the most reliable solution. These 5 extensions below is required to translate a WooCommerce store-
<ol>
<li><a href="https://wpml.org/?aid=106335&affiliate_key=EbXH25fvBE9b" rel="nofollow ugc">Sitepress Multilingual</a></li>
<li>WooCommerce Multilingual</li>
<li>WPML Translation Management</li>
<li>WPML Media</li>
<li>WPML String Translation</li>
</ol>
You can purchase and download all these plugin from the same site. Some of these are free!
After purchasing all these extensions and installing, you need to install this extension. It will not work unless you have activated all the plugins mentioned above.
Please remember to set the URL structure to <code>site.com/lang</code>.
Dokan does not support URL parameters. So you can NOT set the URL structure to be <code>site.com?lang=nl</code>
This extension does not have any settings. Everything is controlled from WPML settings page.

Dokan WPML

WPML integration for Dokan Multivendor Plugin

WPML comment merging vs Dokan WPML