add option for selective PTR generation on hosts.cgi

In some cases, it might be useful to create an additional
host (i.e. for round robin loadbalancing) without assigning
another PTR to the IP address specified.

This patch introduces the ability to check or uncheck
PTR generation for each host individually.

Partially fixes #12030

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

langs/de/cgi-bin/de.pl

@@ -1262,6 +1262,7 @@
 'generate dh key' => 'Diffie-Hellman Key generieren',
 'generate iso' => 'ISO erstellen',
 'generate root/host certificates' => 'Erzeuge Root/Host-Zertifikate',
+'generate ptr' => 'PTR erzeugen',
 'generate tripwire keys and init' => 'Tripwire Initalisierung',
 'generatekeys' => 'Neue Schlüssel erzeugen',
 'generatepolicy' => 'Neue Policy erstellen',
@@ -1998,6 +1999,7 @@
 'proxy reports today' => 'Heute',
 'proxy reports weekly' => 'Wöchentliche Berichte',
 'psk' => 'PSK',
+'ptr' => 'PTR',
 'pulse' => 'Puls',
 'pulse dial' => 'Pulswahl:',
 'qos add subclass' => 'Unterklasse hinzufügen',