How to translate menus?

Unfortunately translating for menus isn’t implemented yet. In my site I’m switching nav menu based on the current locale by using this additional code in my custom theme’s functions.php:

add_action( 'init', 'cf7com_register_additional_menus', 11 );

function cf7com_register_additional_menus() {
	register_nav_menu( 'primary_ja', _x( 'Primary (Japanese)', 'nav menu location', 'cf7com' ) );
}

add_filter( 'wp_nav_menu_args', 'cf7com_nav_menu_args' );

function cf7com_nav_menu_args( $args ) {
	$locale = get_locale();

	if ( 'ja' == $locale )
		$args['theme_location'] = 'primary_ja';

	return $args;
}

Hope this helps.

Thanks for the tip!

I just wondered if there is something I fail to notice.

With a little tweaking this worked well for me. Thanks Takayuki!

I am quite new to php and would love a little help…
How can I set up menu switching with 3 different languages (Dutch, English and French). I use pagelines framework that uses hooks to place code in the right area. Can you help me with the code for 3 languages and also if its possible what the hooks are in your code. Thanks a lot!

Hello, this is how we solved switching menu based on what language is currently being displayed:

I have 3 menus registerred:

register_nav_menu( 'sv_SE_top-menu', 'Top Menu Sv' );
register_nav_menu( 'de_DE_top-menu', 'Top Menu De' );
register_nav_menu( 'en_US_top-menu',  'Top Menu En' );

In header.php (or where you render you navigation):

wp_nav_menu( array( 'theme_location' => apply_filters( 'language_prefix_menu', 'top-menu' ) ) );

In functions.php:

function add_language_prefix($menu_identifier) {
    global $post;
    $language_prefix = get_post_meta( $post->ID, '_locale', true );
    return $language_prefix . '_' . $menu_identifier;
}
add_filter('language_prefix_menu', 'add_language_prefix');

The above is probably cleaner but here’s another way to slice it using 2 languages and 4 menus:
functions.php

function register_my_menus() {
  register_nav_menus(
    array(
      'primary-en' => __( 'Primary En' ),
      'secondary-en' => __( 'Secondary En' )
    )
  );
}
add_action( 'init', 'register_my_menus' )

header.php

<?php $locale = get_locale();

	if ('es_ES' == $locale  ) { ?>
                    <?php $theme->hook('menu_primary'); ?>
<?php } else { ?>
<?php wp_nav_menu( array( 'theme_location' => 'primary-en', 'container_class' => 'menu-primary-container' ) ); ?>
<?php } ?>

Repeat if clause for additional menus.