Thank you, my mistake there.
I was editing my previous post because i've noticed that the item i added in Course admin block doesnt start with a capital letter, even though in my lang file, $string['pluginname']= 'Ecoclipaluno' i've declared with a capital letter.
i also changed the text in the navigation_node creation just to see any diferences, but its still all small letters. $foonode= navigation_node::create(
$strfoo,
$url,
navigation_node::NODETYPE_LEAF,
'Ecoclipaluno',
'Ecoclipaluno',
new pix_icon('i/users', $strfoo)
How can i put it with a starting capital letter?