James

WPTranslator plugin allows you to add a widget to your site providing translations in to multiple languages.
If someone visits your site and wants to translate it they can simply click a flag or select a language from the dropdown box to translate the text into their preferred language.
To view the options available activate the plugin and then go to Settings > WPTranslator
We have kept it really simple with just some styling options.
Visit the main website for news and additional information: <a href="http://wptranslator.com/" title="Wordpress Translator" rel="nofollow ugc">WordPress Translator</a>
It is simple to install and you can place a widget anywhere on your site with flags or a drop down box which when clicked translates your site into the language specified.
If you like the plugin please leave a review. Any suggestions or ideas for how we can improve the plugin would be greatly appreciated.
Full list of languages available for translation at <a href="http://wptranslator.com/full-list-of-translation-languages-available/" title="full list of translation languages" rel="nofollow ugc">WordPress Translation Languages</a>

WPTranslator

WPTranslator allows visitors to translate your site into any language

Akshar Soft Solutions

This plugin lets users change their administration language to native English (en_US locale).
This is useful during site development and for people more accustomed to the english administration panel, even if your site 
is in another language. (The frontend will still use the native language.)
This plugin is fully compatible with WooCommerce and can correctly identify and translate frontend / backend AJAX requests. 
If you are using this plugin with Advanced Custom Fields, please move the as-english-wp-admin.php file to the /wp-content/mu-plugins/ folder 
(create it if it does not exist). This is an ACF limitation.
This plugin is developer friendly and small (~200 lines of code). Check the FAQ for customization examples.
Usage
Basic usage
Once you have installed and activated the plugin, navigate to any admin page and check the top admin bar. A button will 
display your current locale. If you click on it, the admin will change to English locale (en_US). To switch back, 
press the button again.
<h3>Requirements</h3>
<ul>
<li>PHP 5.3 or higher</li>
</ul>
<h3>Translations</h3>
<ul>
<li>None</li>
</ul>

AS English Admin

Lets users change their administration language to English

WPTranslator vs AS English Admin