Steph

This plugin assumes you have a site in two or more languages, and that you are using a separate WordPress install for each language. It helps you create links between the same pages in different 
language versions.
You should have a pattern of parallel sites with urls like http://stephanie-booth.com/en/, http://stephanie-booth.com/de/, http://stephanie-booth.com/fr/. Maybe the page 
http://stephanie-booth.com/en/about is equivalent to the page http://stephanie-booth.com/fr/a-propos. The plugin adds a DBX box in the edit/create page admin form, named “Other Language Slugs”. In 
this case, you’d edit the “about” page, and paste the fr slug (“a-propos”) in the appropriate field.
The plugin will then display a small link to the page in the other language at the bottom of your page, or in your menu bar if you’re using a Sandbox-based theme.
Careful! This only works for Pages, not posts!
For intelligent user redirection when they land on the home page, you might want to try using the technique described here: http://climbtothestars.org/archives/2007/12/28/browser-language-detection-and-redirection/
<h3>Future Development</h3>
Here’s what I’d like this plugin to do, someday:
<ul>
<li>automatically capture URLs like http://stephanie-booth.com/en/a-propos and redirect them to http://stephanie-booth.com/en/about (that’s what happens when people edit URLs directly, just replacing 
the language code — I do it all the time)</li>
</ul>

Bunny’s Language Linker

Helps you create links between equivalent (but different language) pages between WordPress installations.

weDevs

Sabbir Ahmed

alamgircsebd

Rafsun Chowdhury

Dokan, Inc.

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

Bunny’s Language Linker vs Dokan WPML