flexostudio

It allow the user to translate static texts as the example: 
echo _l(‘cat’);
see http://www.flexostudio.com/
<h3>How to use</h3>
need to make php file that is located inside the theme, it must be said lang_ (languages ??which will translate as lang_en.php) 
 and contains the following code:
<?php $FL_DICT = array(
<pre><code> 'cat' => 'Katze',
 'dog' => 'Hund',
.............
</code></pre>
);?> 
where ‘cat’ => ‘Katze’ ‘regulations is a word and its translation.
in function.php to add the code: 
<?php if(class_exists(‘flexoLanguage’)){
<pre><code>$f = dirname(__FILE__);

if(!flexoLanguage::is_set_language())
 flexoLanguage::set_language('en');//selected language

flexoLanguage::add_dictionary($f);

function _l($key){
 return flexoLanguage::_($key);
}
</code></pre>
} 
else{ 
 function _l($key){return $key;} 
}?>
and everywhere in the code where you write words you want to have a translation in another language and place: 
_l(‘cat’);

flexo-language

Add another language functionality, that is file based without compressions see: http://www.flexostudio.com/

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.

flexo-language vs Admin Locale