Load another .mo file after user changed language

Hi,

In my site, user can change language ( $locale ) when he click on a button.
It reload the site with the new language.
If i can change the language theme with this in index.php for example:
$localelang = get_locale();
load_default_textdomain();
load_textdomain($localelang, WP_LANG_DIR.’/’.$localelang.’.mo’);

I tried to do the same thing after for my plugins and it doesn’t work.
How to properly change the text domain of a plugin when it already loaded ?
I don’t want to use an external plugin to do this. I would like to know how to do this programmatically.

Thank you,

Nos2013