For help, see http://codex.wordpress.org/Translating_WordPress

Steps for translating:

    1. Create a copy of awesome-live-chat.po and
       save it as awesome-live-chat-fr_FR.po
       (where fr is the language for french and FR is for France)
    2. Use a translating program like http://sourceforge.net/projects/poedit/
       open awesome-live-chat-fr_FR.po to translate the strings and then save.
       A .mo file will be generated which will be used by wordpress.

To change the language of wordpress:

    Open wp-config.php and modify define('WPLANG', 'fr_FR');