Dominik Schilling

This plugin helps you to declutter your WordPress login screen by removing the language switcher which has been <a href="https://make.wordpress.org/core/2021/12/20/introducing-new-language-switcher-on-the-login-screen-in-wp-5-9/" rel="nofollow ugc">introduced in WordPress 5.9</a>.
Removing the dropdown makes sense when you only have one additional language installed and don’t intend to change back to English for example. In this case you can simply install and activate the plugin. There are no futher settings.
<h3>What does this plugin do?</h3>
The plugin uses the default <a href="https://developer.wordpress.org/plugins/hooks/" rel="nofollow ugc">WordPress Hooks API</a> and disables the language selector with the following one-liner:
<pre><code>add_filter( 'login_display_language_dropdown', '__return_false' );
</code></pre>

Disable Login Language Switcher

Does what it says on the tin.

Removes the language dropdown from the login screen.

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.

Disable Login Language Switcher vs WPML comment merging