Please fix some issues in mod/data and blocks/navigation.

The module /mod/data doesn't support multilanguage tags <span lang="XX">...</span>. For fix the issue the module needs to improve. And the first step is to add multilanguage support for templates:

// actual replacement of the tags

$newtext = str_ireplace($patterns, $replacement, format_text($data->{$template}));

$newtext = str_ireplace($patterns, $replacements, format_text($data->{$mode}));

Fix navigation block. When the site enters for the first time, the navigation block does not contain the course $SITE. When I go to any of the courses, it appears. And this category is always collapsed. It has to be present initially in the expanded state then main page opened. It should be collapsed only when there is insufficient space. The primitive way of solving this problem is given below.

$liclasses = array($item->get_css_type(), 'depth_'.$depth);

if ($item->has_children() && (!$item->forceopen || $item->collapse) &&

    !($item->type == navigation_node::TYPE_COURSE && $depth == 2)) {

    $liclasses[] = 'collapsed';

}

...or...

$this->rootnodes['site']  = $this->add_course($SITE);