Functions mail_user_update and mail_user_add

show ips only with vhost = y and  show directive_snippets for the admin even if they are set to customer_viewable = 'n'

Helmo authored Sep 24, 2019 and Till Brehm committed Sep 24, 2019

Some form of inheritance might be nice to reduce the amount of duplication in these files.

Some were already in English, most were still in German.

Fixed PHP Warning:  Undefined property wb of class app in /usr/local/ispconfig/interface/lib/app.inc.php on line 81

Added test script for dns_templatezone_add remote API function

- removed separate rspamd greylisting setting for policy and respect mail user/alias/forward/catchall setting for greylisting, fixes #5379

- change the way greylisting setting is evaluated (prio is now 1. mail user, 2. mail forward/alias, 3. catchall), fixes #5378