No longer autogenerate passwords for password reset when
$conf['autopasswd'] is disabled. Instead allow to change the password
online.

* resetpassword:
  added a timelimit for password reset tokens
  removed commented line
  use correct lang string for password mismatch
  removed outdated language string. it has to be retranslated
  German translation for password reset
  honor autopasswd setting for resend password

Conflicts:
	inc/lang/no/lang.php
	inc/lang/sl/lang.php