Quick Localisation allows site admins to patch Wordpress translations of any theme and any plugin without leaving the control panel

Add a custom HREFLANG meta box on your post to manually edit the link between your post and a translation (which could be outside your domain).

Add an abbreviation format button to the formatting toolbar in the block editor.

This plugin slice the language attribute for HTML tag, For example: lang="en-US" to lang="en"

Add lang attribute to the text formatting toolbar in the block editor.

This wordpress plugin adds a meta box for specifying html lang="" language per post.

This plugin allows to have admin panel in different language (for example, admin's native language) from blog's home language.

Site Language Definition is a simple plugin for forcing the web browser to know what language your site is in.

Switch between languages with ease using xili-language plugin. Displaying only the posts in the set language.

Add language-tags via TinyMCE to comply with the Web Content Accessibility Guidelines.

Add a flag icon to link corresponding to the hreflang attribute.