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

Alex Zappa

HTML Global lang Attribute

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

nilsnh

Set HTML lang attribute per post

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

Kashiv

Admin Language

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

Complete Language Switcher

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

Hailstorm

Accessibility Language

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

citywanderer

Miina Sikk

Site Language Definition

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

Geoffrey

Juiz Lang Attribute

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).

Name.ly

Namely

Quick Localization (Quick Localisation)

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

Whodunit

Jb Audras

Guillaume TURPIN

Abbreviation Button for the Block Editor

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

julienvdg

hreflang Flag

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

Disclaimer: This plugin was merged into WordPress Core. It is not relevant anymore to install it. I plan to ask for a removal from the repo by the end of the year.
The intent of this plugin is to provide a way to ensure any language change in the content of a page is indicated to assistive technologies. This feature is not available by default in the block editor so it is difficult to make a website fully compliant to WCAG guidelines using the block editor for now.
We clearly hope this feature will be natively implemented in the block editor in middle term, because this very simple feature is really needed to help people to create accessible websites. But in short terms, we need a solution and this plugin is a solution you may want to use to make your website compliant to accessibility guidelines 🙂
For more context: this plugin helps you to make your website compliant to the Web Content Accessibility Guidelines (WCAG) success criterion 3.1.2: “Language of Parts”. The purpose of this success Criterion is to ensure that user agents can correctly present content written in multiple languages.
As per Web Content Accessibility Guidelines:
This makes it possible for user agents and assistive technologies to present content according to the presentation and pronunciation rules for that language. This applies to graphical browsers as well as screen readers, braille displays, and other voice browsers.
Both assistive technologies and conventional user agents can render text more accurately if the language of each passage of text is identified. Screen readers can use the pronunciation rules of the language of the text. Visual browsers can display characters and scripts in appropriate ways.
This is especially important when switching between languages that read from left to right and languages that read from right to left, or when text is rendered in a language that uses a different alphabet. Users with disabilities who know all the languages used in the Web page will be better able to understand the content when each passage is rendered appropriately.

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