WordPress at a glance
action is not described

load_textdomain action-hook . WP 2.9.0

Fires before the MO translation file is loaded.

Usage

add_action( 'load_textdomain', 'action_function_name_9163', 10, 2 );
function action_function_name_9163( $domain, $mofile ){
	// action...
}
$domain(string)
Text domain. Unique identifier for retrieving translated strings.
$mofile(string)
Path to the .mo file.

Where the hook is called

load_textdomain()
load_textdomain
wp-includes/l10n.php 620
do_action( 'load_textdomain', $domain, $mofile );

Where the hook is used (in WP core)

Does not used.