Adds an attributes parameter to the ldap adapter (#184)

* Adds an attribute parameter to the ldap adapter

Using this parameter is much more efficient than the default action (which is to return all attributes and their associated values). The use of this parameter should therefore be considered good practice.

(from https://www.php.net/manual/en/function.ldap-search.php)

* Updates the docs about ldap_attributes parameter

* Enhances portuguese translation

* Update backend/Services/Auth/Adapters/LDAP.php

Commit suggestion

docs/configuration/auth.md

@@ -100,6 +100,7 @@ Replace your current Auth handler in `configuration.php` file like this:
                     'ldap_bindPass'=>'ldapbinduser-password',
                     'ldap_baseDN'=>'cn=users,dc=ldap,dc=example,dc=com',
                     'ldap_filter'=>'(uid=*)', //ex: 'ldap_filter'=>'(&(uid=*)(memberOf=cn=administrators,cn=groups,dc=ldap,dc=example,dc=com))',
+                    'ldap_attributes' => ["uid","cn","dn"],
                     'ldap_userFieldMapping'=> [
                         'username' =>'uid',
                         'name' =>'cn',