wtranslator

WTranslator makes your website multilingual with just a few clicks. Your visitors can instantly switch between languages and read your content in their preferred language – no manual translation needed!
How it helps your visitors: 
* Read your website in their native language 
* Switch languages with a simple click 
* Optional automatic language suggestion from the browser (and Cloudflare country header when available), if you enable it in settings 
* Their language choice is remembered for future visits
What makes it great: 
* 100+ Languages – From English and Spanish to Chinese, Arabic, and everything in between 
* Beautiful Language Switcher – Elegant dropdown or flag icons that match your site design 
* Lightweight – Translation runs in the visitor’s browser via Google’s translate script; no API key is required 
* Powered by Google Translate – Uses Google’s translation technology to help translate your content 
* Works Everywhere – Compatible with any WordPress theme and most plugins
Perfect for: 
* Business websites reaching international customers 
* Blogs with a global audience 
* E-commerce stores selling worldwide 
* Educational content for diverse learners 
* Any website that wants to welcome visitors in their own language
<h3>External services</h3>
This plugin uses the following third-party service:
<ul>
<li>
Google Translate – Translation runs in the visitor’s browser via Google’s Translate Element. No API key required. See: <a href="https://policies.google.com/terms" rel="nofollow ugc">Google Terms of Service</a>, <a href="https://policies.google.com/privacy" rel="nofollow ugc">Google Privacy Policy</a>.
</li>
<li>
Auto-detect (no third-party) – Uses only browser Accept-Language and Cloudflare header when present. No IP sent to any service.
</li>
</ul>

WTranslator

Make your WordPress site multilingual with Google Translate. Visitors can read your content in their preferred language.

Yann at WP&amp;Co

This very simple WordPress plugin automatically sets up the WP language environment based on the first part of the url of any page.
It will automatically setup the right XML header lang attribute + the internal WordPress $locale variable that is used to load the right language files for i18n and l10n (.po, .mo).
<h4>Usage:</h4>
Your blog URL structure should always begin with an official two-letter langage code, for example:
<ul>
<li>/en/… for english</li>
<li>/es/… for Spanish</li>
<li>/ja/… for Japanese</li>
<li>/fr/… for French</li>
<li>etc.</li>
</ul>
Please use only lower-case codes.
Pages that don’t comply to this URL scheme will still get your blog’s default locale setting, as configured in your wp-config.php file.
Sometimes you need to rename or copy some of your po/mo files, for example French language PO files are usually named like this: <code>fr_FR.po</code>; 
just copy it to <code>fr.po</code> to make it work with a two-letter code.
<h4>Example</h4>
This plugin is used for extended multi-language support on the <a href="http://post2peer.com/about" title="Post2Peer posts and sites directory" rel="nofollow ugc">Post2Peer.com open posts directory</a>.
<h4>Français</h4>
Ce plugin permet très simplement de faire fonctionner un blog multilingue ou bilingue, français/anglais par exemple.
<h4>Active support</h4>
Drop me a line on my <a href="http://www.yann.com/wp-plugins/yd-setup-locale" title="Yann Dubois' Setup Locale for WordPress" rel="nofollow ugc">YD Setup Locale plugin support site</a> to report bugs, ask for specific feature or improvement, or just tell me how you’re using the plugin.
<h3>Revisions</h3>
0.1.0 Initial beta release
<h3>Did you like it?</h3>
Drop me a line on http://www.yann.com/wp-plugins/yd-setup-locale

YD Setup Locale

Automatically sets up the WP language environment based on first part of url. Will setup XML lang attribute + $locale variable.

WTranslator vs YD Setup Locale