Hi Alessandro,
Menu is the "lost one" as I don't have planned translation for it!
To add multilingual menus, you'll have to modify each and every
language files to add menu translations.
In folder lang, you'll find all language files named: text_standard_XX,
where XX is the language "short" name. you could add variables for all
menu items, this way:
$menu_today = "Today";
$menu_yesterday = "yesterday";
...
Then, modify your menu file: header_menu.php to replace all texts
by variable you just have created.
So, actual menu item:
<a href="today.php" title="Today's observations">Today</a>
become:
<a href="today.php" title="Today's observations"><?php echo $menu_today; ?></a>
This way, all menu items will be translated
Hope this help,
Regards,
Jacques
Ps Before doing changes, update to the latest language files, with your TMM (manage) page!