I propose (see screenshot):
In the green square append static text: "Current default authentication:"
All the underlined blue line to make a single complete line, rather than combining existing ones. Only in this way can be translated into other languages properly.
Marked with a red arrow to move down.
In "en_gb.inc.php"
'S_GUI_ACCESS'=> 'GUI access',
change to
'S_GUI_ACCESS'=> 'GUI access' method,
Link /authentication.php should always display configuration of the current authentication method.
Now, after choosing a different method from the list, he is remembered even after re-logon, and this is misleading.

And at the end translate the "class.cldap.php"