Quite Nice Stuff

Iris Translate provides flexible website translation with two distinct methods to suit your needs:
Automatic Mode (Free) – Uses Google Translate’s client-side widget for instant translation with no setup required.
Google Cloud API Mode – Server-side translation with SEO-friendly translated URLs, hreflang tags, and full search engine indexability. Free for most websites (see below).
<h4>Key Features</h4>
Translation Methods
<ul>
<li>Automatic Translation – Free client-side translation using Google Translate widget, no API key needed</li>
<li>Google Cloud API Translation – Server-side translation for SEO-friendly, indexable translated content</li>
<li>Configurable fade-in delay to hide flash of untranslated content (Automatic mode)</li>
</ul>
SEO & URL Translation
<ul>
<li>SEO-friendly translated URLs (e.g., <code>/fr/a-propos/</code> instead of <code>/about/</code>)</li>
<li>Automatic hreflang tag generation for proper search engine indexing</li>
<li>Translated URL management interface with bulk translation tools</li>
<li>Individual URL path customization per language</li>
</ul>
Custom Translation Overrides
<ul>
<li>Override any automatic translation with your own custom text</li>
<li>Frontend translation editor for logged-in administrators</li>
<li>Edit translations directly on the page while browsing your translated site</li>
<li>Manage all custom translations from the admin dashboard</li>
</ul>
Language Selector Widgets
<ul>
<li>Multiple widget styles: Dropdown, Dropdown with flags, List, List with flags</li>
<li>Floating language selector with configurable position (corners of the screen)</li>
<li>Widget support for sidebars</li>
<li>Shortcode support: <code>[iris_translate]</code></li>
<li>PHP function support for theme integration</li>
<li>Display language names in their native script (e.g., “日本語” instead of “Japanese”)</li>
</ul>
Supported Languages
Over 25 languages supported including: English, Spanish, French, German, Italian, Portuguese, Dutch, Russian, Japanese, Korean, Chinese (Simplified & Traditional), Arabic, Hindi, Turkish, Polish, Swedish, Norwegian, Danish, Finnish, Greek, Czech, Romanian, Hungarian, Thai, Vietnamese, and Indonesian.
<h3>External Services</h3>
This plugin connects to Google services to provide translation functionality. By using this plugin, you agree to Google’s terms of service.
<h4>Automatic Translation Mode</h4>
When using Automatic Translation mode, this plugin loads the Google Translate Widget from Google’s servers.
What this service does: Provides client-side (in-browser) translation of your website content.
When data is sent: When a visitor selects a language to translate to, their browser communicates directly with Google Translate servers to fetch translations.
What data is sent: 
* The text content of the webpage being translated 
* The visitor’s IP address (sent by their browser to Google) 
* Browser cookies set by Google (including the <code>googtrans</code> cookie to remember language preference)
Service provider: Google LLC
Links: 
* <a href="https://translate.google.com/" rel="nofollow ugc">Google Translate</a> 
* <a href="https://policies.google.com/privacy" rel="nofollow ugc">Google Privacy Policy</a> 
* <a href="https://policies.google.com/terms" rel="nofollow ugc">Google Terms of Service</a>
<h4>Google Cloud API Translation Mode</h4>
When using Google Cloud API mode, this plugin sends content to the Google Cloud Translation API for server-side translation.
What this service does: Provides server-side translation of your website content, enabling SEO-friendly translated URLs.
When data is sent: 
* When a visitor accesses a translated URL (e.g., <code>/fr/your-page/</code>), the page content is sent to Google for translation 
* When an administrator uses the “Translate All URLs” feature to bulk-translate URL slugs 
* Translations are cached locally to minimize API calls
What data is sent: 
* The text content of pages and posts being translated 
* URL slugs when using the URL translation feature 
* Your Google Cloud API key (for authentication)
What data is NOT sent: 
* Visitor IP addresses (translation happens on your server, not in the visitor’s browser) 
* Personal visitor information 
* User account data
Service provider: Google Cloud (Google LLC)
Links: 
* <a href="https://cloud.google.com/translate" rel="nofollow ugc">Google Cloud Translation API</a> 
* <a href="https://cloud.google.com/terms/cloud-privacy-notice" rel="nofollow ugc">Google Cloud Privacy Policy</a> 
* <a href="https://cloud.google.com/terms" rel="nofollow ugc">Google Cloud Terms of Service</a> 
* <a href="https://cloud.google.com/translate/pricing" rel="nofollow ugc">Google Cloud Translation API Pricing</a> (includes free tier)
<h4>Cookies</h4>
This plugin sets the following cookie:
<ul>
<li>googtrans – Stores the visitor’s selected language preference. This is a session cookie used by Google Translate to remember which language the visitor chose. No personal data is stored in this cookie.</li>
</ul>
<h4>Data Privacy</h4>
<ul>
<li>In Automatic mode, translation processing occurs on Google’s servers via the visitor’s browser</li>
<li>In Google Cloud API mode, translation processing occurs on Google’s servers but is initiated by your WordPress server, not the visitor’s browser</li>
<li>Translated content is cached in your WordPress database to improve performance and reduce external API calls</li>
<li>No visitor personal data is collected or stored by this plugin</li>
<li>No visitor tracking is performed by this plugin beyond the language preference cookie</li>
</ul>

Iris Translate

Translate your WordPress site with free automatic translation or SEO-friendly Google Cloud API translation.

ResponsiveVoice

<a href="https://responsivevoice.org/wordpress-text-to-speech-plugin/" rel="nofollow ugc">ResponsiveVoice</a> is a HTML5-based Text-To-Speech library designed to add voice features to WordPress across all smartphone, tablet and desktop devices. It supports 51 languages through 168 voices and has no dependencies.
Languages include UK English, US English, Spanish, French, Deutsch, Italian, Greek, Hungarian, Turkish, Russian, Dutch, Swedish, Norwegian, Japanese, Korean, Chinese, Hindi, Serbian, Croatian, Bosnian, Romanian, Catalan, Australian, Finnish, Afrikaans, Albanian, Arabic, Armenian, Czech, Danish, Esperanto, Hatian Creole, Icelandic, Indonesian, Latin, Latvian, Macedonian, Moldavian, Montenegrin, Polish, Brazilian Portuguese, Portuguese, Serbo-Croatian, Slovak, Spanish Latin American, Swahili, Tamil, Thai, Vietnamese and Welsh.
<h3>Support and Questions visit here first:</h3>
<blockquote>
<ul>
<li><a href="https://responsivevoice.org/support" rel="nofollow ugc">Support</a></li>
</ul>
</blockquote>
<h3>Useful Links:</h3>
<blockquote>
<ul>
<li><a href="https://responsivevoice.org/wordpress-text-to-speech-plugin/" rel="nofollow ugc">Live Demo</a></li>
<li><a href="https://responsivevoice.org/wordpress-text-to-speech-plugin/" rel="nofollow ugc">Homepage</a></li>
<li><a href="https://responsivevoice.org/wordpress-text-to-speech-plugin/" rel="nofollow ugc">Documentation</a></li>
</ul>
</blockquote>
<h3>Features:</h3>
<ul>
<li>Listen to any post or page with the tap of a button</li>
<li>Shortcodes to place Listen button anywhere on the post or page</li>
<li>51 languages supported through 168 voices</li>
<li>Unlimited text to speech</li>
<li>Easy access to content for website users, tap to listen to your page or post read aloud</li>
<li>A more functional website for a range of users including visually impaired and the elderly</li>
<li>Web Accessibility Compliance Group 2.0, ADA and BS 8878:2010 features</li>
</ul>
<h3>Usage:</h3>
<ul>
<li>
From version 1.6.6, we added API Key configuration to WordPress settings. To experience the complete range of voices, 
<a href="https://responsivevoice.org/register" rel="nofollow ugc">register free and get your API Key</a>. The plugin will still work without it, but 
you will be limited to available browser voices.
</li>
<li>
It’s Easy – To have the Listen button appear put the following shortcode anywhere in the text of your page or post. 
[responsivevoice_button]
</li>
</ul>
You can select a voice by using the “voice” parameter, and change the text that appears on the button with the “buttontext” parameter. The following shortcode will read in the US English Female voice, and the button will say “Play”. 
 [responsivevoice_button voice=”US English Female” buttontext=”Play”] 
A full list of ResponsiveVoice names is available at <a href="https://responsivevoice.org/text-to-speech-languages/" rel="nofollow ugc">Documentation</a>. Default is UK English Female.
<ul>
<li>Read a whole page, or just sections of text – If you don’t want the whole page or post to be read, just surround the salient text with 
[responsivevoice]Text you want ResponsiveVoice to read [/responsivevoice] 
This tag also supports the voice and buttontext parameters. Additionally, you can place the button after the text (it will be before by default) with the “buttonposition” tag, like so: 
[responsivevoice buttonposition=”after”]Text you want ResponsiveVoice to read [/responsivevoice]</li>
</ul>
The shortcodes also allow other parameters. You can adjust the Voice’s pitch, volume and rate with 
 [responsivevoice_button rate=”1″ pitch=”1.2″ volume=”0.8″ voice=”US English Female” buttontext=”Play”]
For more details, please see the <a href="https://responsivevoice.org/wordpress-text-to-speech-plugin/" rel="nofollow ugc">Documentation</a>
<h4>Requirements</h4>
There are no requirements, you do not need to install cURL.

ResponsiveVoice Text To Speech

Not so much on LeapPad or iPhone/Safari. Support was prompt and courteous in responding to my query about this. May be a LeapPad issue rather than an issue with this plugin. For fun, have the Russian voices read the text "moose and squirrel"!

Works great on desktop

ResponsiveVoice the leading HTML5 text to speech synthesis solution, is now available for WordPress. Over 51 languages through 168 voices.

Iris Translate vs ResponsiveVoice Text To Speech