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.

John Clause

Enables <a href="https://wordpress.org/plugins/qtranslate-x/" rel="ugc">qTranslate-X</a> multilingual framework for plugin <a href="https://wordpress.org/plugins/js-composer-qtranslate-x" rel="ugc">WPBakery Visual Composer</a>.
At least version 3.3 of <a href="https://wordpress.org/plugins/qtranslate-x/" rel="ugc">qTranslate-X</a> or <a href="https://github.com/qTranslate-Team/qtranslate-x/archive/3.2.9.9.4.zip" rel="nofollow ugc">alpha pre-release</a> is required.
This plugin is currently a work in progress, please review the <a href="https://wordpress.org/plugins/js-composer-qtranslate-x/other_notes/" rel="ugc">Known Issues</a> and report the features, which did not work for you.
<h3>Known Issues</h3>

WPBakery Visual Composer & qTranslate-X

Enables multilingual framework for plugin "WPBakery Visual Composer".

WPML comment merging vs WPBakery Visual Composer & qTranslate-X