inkylab

Indepth Analytics Structured Metadata adds structured metadata tags to the <code><head></code> section of WordPress pages. The plugin outputs information about posts, pages, taxonomy archives, and search pages using custom <code>indepth:*</code> meta properties.
The plugin can also load an optional external header script configured by administrators from the WordPress dashboard.
Supported metadata includes:
<ul>
<li>Post or page ID</li>
<li>Content type and post type</li>
<li>Publication date</li>
<li>Estimated reading time</li>
<li>Featured image URL</li>
<li>Categories and taxonomy terms</li>
<li>Authors and author avatars</li>
<li>Collaborators and collaborator avatars</li>
<li>Current language</li>
<li>Available translations when using Polylang</li>
</ul>
The plugin works with standard WordPress APIs and follows WordPress coding and security practices.
Features:
<ul>
<li>Outputs <code>indepth:*</code> metadata tags in the document head</li>
<li>Supports posts, pages, archives, and search results</li>
<li>Optional taxonomy selection for category metadata</li>
<li>Optional external header script loader</li>
<li>Compatible with Polylang translations</li>
<li>Translation-ready</li>
<li>Compatible with PHP 8.2 and newer</li>
</ul>

Indepth Analytics Structured Metadata

Adds structured metadata tags and optional header scripts to WordPress pages.

Modeewine

<h4>What is «Polylang Theme Strings» and what for is it?</h4>
This plugin gives additional features to the plugin Polylang. It automatically scans all templates files and scripts of the active WP theme (and all plugins) for available strings that can be translated. For example:
<ul>
<li><code>pll__('...');</code></li>
<li><code>pll_e('...');</code></li>
</ul>
and adds them to the Polylang registery, after what you can manage the translation of finded strings using the administration panel. It will make your life easier for the development of multilanguage’s projects, because you will not need to enter the needed strings to translate manually – the plugin will do all the work for you. 
Don’t forget that in the example are described the PHP-function calls, that is why they have to be inside of PHP-tags.
<h4>How works «Polylang Theme Strings»?</h4>
You have to install the plugins «Polylang» and «Polylang Theme Strings» on your multilanguage WordPress CMS project and they must be both active. When you are in the settings of plugin (Polylang) in the tab «Strings translation» the «Polylang Theme Strings» scans automatically the active theme of your project, find all the code strings that needed to be translated, adds them to the register, displays them on that page and gives to user the ability to translate these strings.
Like you can see, the «Polylang Theme Strings» is perfectly integrate with the «Polylang» plugin and works in automatically mode – it is comfortable, simple, and useful!
From version 4.0 «Polylang Theme Strings» got settings page where you can configure the search strings-translations more deeply.
Learn more in <a href="http://modeewine.com/en-polylang-theme-strings" rel="nofollow ugc">http://modeewine.com/en-polylang-theme-strings</a>.

Polylang Theme Strings

I think there is a bug and it is changing the site language to english.

Works fine

Automatic scanning of strings translation in the theme and registration of them in Polylang plugin. Extension for Polylang plugin.

Indepth Analytics Structured Metadata vs Polylang Theme Strings