Loads the textdomain for a plugin.

wp_plugin_i18n.php

<?php
/**
 * Preferably the plugin is (in) a class, so use:
 * add_action( array( &$this, 'textdomain_init');
 */
add_action( 'plugins_loaded', 'textdomain_init' );

/**
 * Initializes the textdomain for this plugin
 */
function textdomain_init() {
	$plugin_dir = basename( plugin_dir_url( __FILE__ ) );
	load_plugin_textdomain( 'domain' , false , $plugin_dir . '/languages' );
}
?>