OpenVPN ccd: created subnet checkfunction in general_functions, because ipsec needs this too!

This should prevent ipsec Hosts/Nets to have same ip addresses than openvpn Hosts/Nets

langs/de/cgi-bin/de.pl

@@ -2231,6 +2231,7 @@
 'you can only define one roadwarrior connection when using pre-shared key authentication' => 'Sie können nur eine Roadwarrior Verbindung definieren, wenn die Pre-shared Schlüsselauthentifizierung verwendet wird.<br/>Entweder haben Sie bereits eine Roadwarrior Verbindung mit Pre-shared Schlüsselauthentifizierung, oder Sie versuchen gerade eine hinzuzufügen.',
 'your department' => 'Ihre Abteilung',
 'your e-mail' => 'Ihre E-mail Adresse',
+'ccd err isipsecnet' => 'Diese Subnetzadresse wird bereits für ein IPsec-Netzwerk verwendet.'
 );
 
 #EOF

langs/en/cgi-bin/en.pl

@@ -2264,6 +2264,7 @@
 'you can only define one roadwarrior connection when using pre-shared key authentication' => 'You can only define one Roadwarrior connection when using pre-shared key authentication.<br />Either you already have a Roadwarrior connection with pre-shared key authentication, or you\'re trying to add one now.',
 'your department' => 'Your department',
 'your e-mail' => 'Your e-mail address',
+'ccd err isipsecnet' => 'The given subnet address already used by an IPsec network.',
 );
 
 #EOF