translation update
Add description for modPass-Option
Two new authldap config options: 'userkey' denotes the LDAPattribute holding the username, 'modPass' allows to disablepassword changing by the user.
Revert "German language update"This reverts commit ba09710ad34bb383ae3526e84490a3d545f78866.Conflicts: lib/plugins/authad/lang/de/settings.php
German language update
de/de-informal: language updates for the core, authldap, authmysql, authpgsql