Louy Alakkad

This plugin gives you the ability to run the site in a language (Arabic for example) and use the admin panel in another (like English).
Just go to Settings » General and choose your language.

Admin Locale

This plugin allows you to change the language of the admin panel without changing the whole site language.

ShinichiN

“Add More Body Classes” adds classes to the body tag. The tags added are
<ul>
<li>locale-[locale]: ex.) locale-ja for Japanese sites, locale-en-US for default English sites.</li>
<li>page slug: page-slug-[slug]: ex.) page-slug-about for about page.</li>
<li>post type slug: ex.) testimonial-slug-nobil for a singular( ‘testimonial’ ) page with post_name “nobil”.</li>
</ul>

Add More Body Classes

Body tag with more classes such as locale and page slug.

Admin Locale vs Add More Body Classes