Integrate with i18n_menu module

Just noticed I needed this on a site.
So I implemented a quick fix there in og_menu_block_view

    $mtitle = $menu->mtitle;
    if (function_exists('i18n_string') && module_exists('i18n_menu')) {
      $mtitle = i18n_string('menu:menu:' . $menu->mname . ':title', $mtitle);      
    }

replacing$menu->mtitle with $mtitle in the code afterwards

TODO
- Create proper patch
- Document other issues with i18n and implement fixes.