OzTheGreat

Adds a multiple select box to every non-admin user profile that allows admins to 
select which languages that user can see / edit in the wp-admin.
Languages that a user cannot see are hidden. If they try to switch surreptitiously 
it will throw an error message.
This plugin REQUIRES WPML and is useless without it.

WPML Editor Languages

Allows admins to restrict users to specific languages in the WordPress admin

Pieter Bos

This plugin combines comments from all translations of the posts and pages using WPML. Comments are internally still attached to the post or page in the language they were made on. 
Naturally the WPML plugin is required to run.
This is a fixed version of the no longer maintained WPML Comment Merging plugin: 
https://wordpress.or/plugins/wpml-comment-merging/ and https://github.com/JulioPotier/wpml-comments-merging
There are no Settings, it simply does what it says on the label.
This plugin was developed with the assistance of ChatGPT, an AI language model created by <a href="https://www.openai.com/" rel="nofollow ugc">OpenAI</a>.
If you are looking to show comments in all languages on your website with WPML installed, I highly recommend installing the Multilingual Comments WPML plugin.
I support this plugin exclusively through <a href="https://github.com/senlin/multilingual-comments-wpml/issues" rel="nofollow ugc">Github</a>. Therefore, if you have any questions, need help and/or want to make a feature request, please open an issue here. You can also browse through open and closed issues to find what you are looking for and perhaps even help others.
Thanks for your understanding and cooperation.
If you like the Multilingual Comments WPML plugin, please consider leaving a <a href="https://wordpress.org/support/view/plugin-reviews/multilingual-comments-wpml?rate=5#postform" rel="ugc">review</a>. Thanks!
Multilingual Comments WPML by <a href="https://so-wp.com/plugin/multilingual-comments-wpml" rel="nofollow ugc">Pieter Bos</a>.

Multilingual Comments WPML

This plugin combines comments from all translations of the posts and pages using WPML.

WPML Editor Languages vs Multilingual Comments WPML