Custom Post Translation not activated

Hello,
I’m using your plugin on my website and everything works fine except custom post type translations.

I use the TwentyFour theme with a child theme where I’ve added the custom post definition in the functions.php file.
I’ve already saw these posts : http://wordpress.org/support/topic/make-my-custom-post-types-multilingual and http://wordpress.org/support/topic/polylang-and-custom-post-types but I doesn’t work with my installation.

I’ve set the show_ui to true on my custom post definition and added this code on my functions.php :

add_filter('pll_get_post_types', 'my_pll_get_post_types');
function my_pll_get_post_types($types) {
	return array_merge($types, array('tea' => 'tea'));
}

Nothing is shown in the page of my tea posts neither in the edit page.
I’m blocked, can you help me ?

Thanks,
Guillaume Besson

https://wordpress.org/plugins/polylang/